Create comprehensive gym membership management system

Features: - User registration and authentication with JWT tokens - Multi-level admin access (Admin and Super Admin) - Gym management with membership plans - Subscription management with payment integration - Stripe and Paystack payment gateway support - Role-based access control - SQLite database with Alembic migrations - Comprehensive API endpoints with FastAPI - Database models for users, gyms, memberships, subscriptions, and transactions - Admin endpoints for user management and financial reporting - Health check and documentation endpoints Core Components: - FastAPI application with CORS support - SQLAlchemy ORM with relationship mapping - JWT-based authentication with bcrypt password hashing - Payment service abstraction for multiple gateways - Pydantic schemas for request/response validation - Alembic database migration system - Admin dashboard functionality - Environment variable configuration
2025-06-20 09:08:21 +00:00 · 2025-06-20 09:08:21 +00:00 · b78ac1f072
commit b78ac1f072
parent 13d822da7d
40 changed files with 2244 additions and 2 deletions
--- a/README.md
+++ b/README.md
@ -1,3 +1,177 @@
-# FastAPI Application
+# Gym Membership Management System

-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A comprehensive FastAPI-based platform for gyms to manage member data and subscriptions with integrated payment processing.
+
+## Features
+
+- **User Management**: User registration, authentication, and profile management
+- **Gym Management**: Multi-gym support with gym registration and management
+- **Membership Plans**: Flexible membership plan creation and management
+- **Subscription Management**: Handle user subscriptions to membership plans
+- **Payment Integration**: Support for Stripe and Paystack payment gateways
+- **Multi-level Admin Access**: 
+  - Admin: Can manage users, gyms, memberships, and subscriptions
+  - Super Admin: Full access including financial data and admin management
+- **Role-based Access Control**: Different permission levels for users, admins, and super admins
+
+## Tech Stack
+
+- **Backend**: FastAPI (Python)
+- **Database**: SQLite with SQLAlchemy ORM
+- **Authentication**: JWT tokens with bcrypt password hashing
+- **Migrations**: Alembic for database migrations
+- **Payment Gateways**: Stripe and Paystack integration
+- **Code Quality**: Ruff for linting and formatting
+
+## Project Structure
+
+```
+├── app/
+│   ├── api/v1/endpoints/     # API endpoints
+│   ├── core/                 # Core configurations and security
+│   ├── db/                   # Database configuration
+│   ├── models/               # SQLAlchemy models
+│   ├── schemas/              # Pydantic schemas
+│   └── services/             # Business logic services
+├── alembic/                  # Database migrations
+├── main.py                   # FastAPI application entry point
+└── requirements.txt          # Python dependencies
+```
+
+## API Endpoints
+
+### Authentication
+- `POST /api/v1/auth/register` - User registration
+- `POST /api/v1/auth/login` - User login
+
+### Users
+- `GET /api/v1/users/me` - Get current user profile
+- `PUT /api/v1/users/me` - Update user profile
+- `GET /api/v1/users/me/memberships` - Get user gym memberships
+- `GET /api/v1/users/me/subscriptions` - Get user subscriptions
+
+### Gyms
+- `GET /api/v1/gyms/` - List all gyms
+- `GET /api/v1/gyms/{gym_id}` - Get gym details
+- `POST /api/v1/gyms/{gym_id}/join` - Join a gym
+- `GET /api/v1/gyms/{gym_id}/membership-plans` - Get gym membership plans
+- `POST /api/v1/gyms/` - Create gym (Admin only)
+- `PUT /api/v1/gyms/{gym_id}` - Update gym (Admin only)
+
+### Membership Plans
+- `GET /api/v1/memberships/plans` - List membership plans
+- `GET /api/v1/memberships/plans/{plan_id}` - Get plan details
+- `POST /api/v1/memberships/plans` - Create plan (Admin only)
+- `PUT /api/v1/memberships/plans/{plan_id}` - Update plan (Admin only)
+- `DELETE /api/v1/memberships/plans/{plan_id}` - Deactivate plan (Admin only)
+
+### Subscriptions
+- `GET /api/v1/subscriptions/` - Get user subscriptions
+- `GET /api/v1/subscriptions/{subscription_id}` - Get subscription details
+- `POST /api/v1/subscriptions/` - Create subscription
+- `POST /api/v1/subscriptions/{subscription_id}/cancel` - Cancel subscription
+- `PUT /api/v1/subscriptions/{subscription_id}` - Update subscription (Admin only)
+
+### Payments
+- `POST /api/v1/payments/initialize` - Initialize payment
+- `POST /api/v1/payments/verify/{transaction_id}` - Verify payment
+- `GET /api/v1/payments/transactions` - Get user transactions
+
+### Admin
+- `GET /api/v1/admin/users` - List all users (Admin only)
+- `GET /api/v1/admin/users/{user_id}` - Get user details (Admin only)
+- `GET /api/v1/admin/users/{user_id}/subscriptions` - Get user subscriptions (Admin only)
+- `GET /api/v1/admin/users/{user_id}/transactions` - Get user transactions (Super Admin only)
+- `GET /api/v1/admin/stats/overview` - Get overview statistics (Admin only)
+- `GET /api/v1/admin/stats/financial` - Get financial statistics (Super Admin only)
+- `GET /api/v1/admin/transactions` - Get all transactions (Super Admin only)
+- `POST /api/v1/admin/invite-admin` - Invite new admin (Super Admin only)
+- `DELETE /api/v1/admin/remove-admin/{admin_id}` - Remove admin (Super Admin only)
+- `GET /api/v1/admin/admins` - List all admins (Super Admin only)
+
+## Environment Variables
+
+Set the following environment variables for production use:
+
+```env
+# Security
+SECRET_KEY=your-secret-key-here
+
+# Stripe Payment Gateway
+STRIPE_SECRET_KEY=sk_test_your_stripe_secret_key
+STRIPE_PUBLISHABLE_KEY=pk_test_your_stripe_publishable_key
+
+# Paystack Payment Gateway
+PAYSTACK_SECRET_KEY=sk_test_your_paystack_secret_key
+PAYSTACK_PUBLIC_KEY=pk_test_your_paystack_public_key
+```
+
+## Installation and Setup
+
+1. **Install dependencies**:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+2. **Set up environment variables** (see Environment Variables section above)
+
+3. **Run database migrations**:
+   ```bash
+   alembic upgrade head
+   ```
+
+4. **Start the application**:
+   ```bash
+   uvicorn main:app --reload
+   ```
+
+5. **Access the API**:
+   - API Documentation: http://localhost:8000/docs
+   - Alternative Docs: http://localhost:8000/redoc
+   - OpenAPI Schema: http://localhost:8000/openapi.json
+   - Health Check: http://localhost:8000/health
+
+## Database
+
+The application uses SQLite with the database file stored at `/app/storage/db/db.sqlite`. The database includes the following main tables:
+
+- `users` - User accounts with role-based access
+- `gyms` - Gym information and details
+- `membership_plans` - Available membership plans per gym
+- `gym_memberships` - User-gym relationships
+- `subscriptions` - User subscriptions to membership plans
+- `transactions` - Payment transaction records
+
+## Payment Integration
+
+The system supports two payment gateways:
+
+### Stripe
+- Handles payments in USD
+- Uses Payment Intents for secure processing
+- Requires STRIPE_SECRET_KEY and STRIPE_PUBLISHABLE_KEY
+
+### Paystack
+- Handles payments in NGN (Nigerian Naira)
+- Uses transaction initialization and verification
+- Requires PAYSTACK_SECRET_KEY and PAYSTACK_PUBLIC_KEY
+
+## Security Features
+
+- JWT-based authentication
+- Password hashing with bcrypt
+- Role-based access control (User, Admin, Super Admin)
+- CORS configuration for cross-origin requests
+- Input validation with Pydantic schemas
+
+## Development
+
+Run the linter to ensure code quality:
+```bash
+ruff check .
+ruff format .
+```
+
+## License
+
+This project was generated by BackendIM, an AI-powered backend generation platform.
--- a/alembic.ini
+++ b/alembic.ini
@ -0,0 +1,97 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version number format
+version_num_format = %04d
+
+# version path separator; default is "/"
+# version_path_separator = :
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# recursive_version_locations = false
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
--- a/alembic/env.py
+++ b/alembic/env.py
@ -0,0 +1,77 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Import your models here
+from app.db.base import Base
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
--- a/alembic/script.py.mako
+++ b/alembic/script.py.mako
@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
--- a/alembic/versions/0001_initial_migration.py
+++ b/alembic/versions/0001_initial_migration.py
@ -0,0 +1,202 @@
+"""Initial migration
+
+Revision ID: 0001
+Revises:
+Create Date: 2024-01-01 00:00:00.000000
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "0001"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Create users table
+    op.create_table(
+        "users",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("email", sa.String(), nullable=False),
+        sa.Column("full_name", sa.String(), nullable=False),
+        sa.Column("phone", sa.String(), nullable=True),
+        sa.Column("hashed_password", sa.String(), nullable=False),
+        sa.Column(
+            "role",
+            sa.Enum("user", "admin", "super_admin", name="userrole"),
+            nullable=False,
+        ),
+        sa.Column("is_active", sa.Boolean(), nullable=True),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.Column("invited_by", sa.Integer(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_users_email"), "users", ["email"], unique=True)
+    op.create_index(op.f("ix_users_id"), "users", ["id"], unique=False)
+
+    # Create gyms table
+    op.create_table(
+        "gyms",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("name", sa.String(), nullable=False),
+        sa.Column("description", sa.Text(), nullable=True),
+        sa.Column("address", sa.String(), nullable=False),
+        sa.Column("city", sa.String(), nullable=False),
+        sa.Column("state", sa.String(), nullable=False),
+        sa.Column("phone", sa.String(), nullable=True),
+        sa.Column("email", sa.String(), nullable=True),
+        sa.Column("is_active", sa.Boolean(), nullable=True),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_gyms_id"), "gyms", ["id"], unique=False)
+    op.create_index(op.f("ix_gyms_name"), "gyms", ["name"], unique=False)
+
+    # Create membership_plans table
+    op.create_table(
+        "membership_plans",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("gym_id", sa.Integer(), nullable=False),
+        sa.Column("name", sa.String(), nullable=False),
+        sa.Column("description", sa.Text(), nullable=True),
+        sa.Column(
+            "plan_type",
+            sa.Enum("basic", "premium", "vip", name="plantype"),
+            nullable=False,
+        ),
+        sa.Column("price", sa.Float(), nullable=False),
+        sa.Column("duration_days", sa.Integer(), nullable=False),
+        sa.Column("features", sa.Text(), nullable=True),
+        sa.Column("is_active", sa.Boolean(), nullable=True),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["gym_id"],
+            ["gyms.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(
+        op.f("ix_membership_plans_id"), "membership_plans", ["id"], unique=False
+    )
+
+    # Create gym_memberships table
+    op.create_table(
+        "gym_memberships",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("gym_id", sa.Integer(), nullable=False),
+        sa.Column(
+            "status",
+            sa.Enum(
+                "active", "inactive", "expired", "suspended", name="membershipstatus"
+            ),
+            nullable=True,
+        ),
+        sa.Column("joined_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["gym_id"],
+            ["gyms.id"],
+        ),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["users.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(
+        op.f("ix_gym_memberships_id"), "gym_memberships", ["id"], unique=False
+    )
+
+    # Create subscriptions table
+    op.create_table(
+        "subscriptions",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("membership_plan_id", sa.Integer(), nullable=False),
+        sa.Column(
+            "status",
+            sa.Enum(
+                "active", "expired", "cancelled", "pending", name="subscriptionstatus"
+            ),
+            nullable=True,
+        ),
+        sa.Column("start_date", sa.DateTime(), nullable=False),
+        sa.Column("end_date", sa.DateTime(), nullable=False),
+        sa.Column("amount_paid", sa.Float(), nullable=False),
+        sa.Column("payment_reference", sa.String(), nullable=True),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["membership_plan_id"],
+            ["membership_plans.id"],
+        ),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["users.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_subscriptions_id"), "subscriptions", ["id"], unique=False)
+
+    # Create transactions table
+    op.create_table(
+        "transactions",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("subscription_id", sa.Integer(), nullable=True),
+        sa.Column("amount", sa.Float(), nullable=False),
+        sa.Column("currency", sa.String(), nullable=False),
+        sa.Column(
+            "status",
+            sa.Enum(
+                "pending", "completed", "failed", "refunded", name="transactionstatus"
+            ),
+            nullable=True,
+        ),
+        sa.Column(
+            "payment_gateway",
+            sa.Enum("stripe", "paystack", name="paymentgateway"),
+            nullable=False,
+        ),
+        sa.Column("gateway_transaction_id", sa.String(), nullable=True),
+        sa.Column("gateway_reference", sa.String(), nullable=True),
+        sa.Column("description", sa.Text(), nullable=True),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["subscription_id"],
+            ["subscriptions.id"],
+        ),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["users.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_transactions_id"), "transactions", ["id"], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f("ix_transactions_id"), table_name="transactions")
+    op.drop_table("transactions")
+    op.drop_index(op.f("ix_subscriptions_id"), table_name="subscriptions")
+    op.drop_table("subscriptions")
+    op.drop_index(op.f("ix_gym_memberships_id"), table_name="gym_memberships")
+    op.drop_table("gym_memberships")
+    op.drop_index(op.f("ix_membership_plans_id"), table_name="membership_plans")
+    op.drop_table("membership_plans")
+    op.drop_index(op.f("ix_gyms_name"), table_name="gyms")
+    op.drop_index(op.f("ix_gyms_id"), table_name="gyms")
+    op.drop_table("gyms")
+    op.drop_index(op.f("ix_users_id"), table_name="users")
+    op.drop_index(op.f("ix_users_email"), table_name="users")
+    op.drop_table("users")
--- a/app/init.py
+++ b/app/init.py
--- a/app/api/init.py
+++ b/app/api/init.py
--- a/app/api/v1/init.py
+++ b/app/api/v1/init.py
--- a/app/api/v1/endpoints/init.py
+++ b/app/api/v1/endpoints/init.py
--- a/app/api/v1/endpoints/admin.py
+++ b/app/api/v1/endpoints/admin.py
@ -0,0 +1,222 @@
+from typing import List
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from sqlalchemy import func
+
+from app.db.session import get_db
+from app.core.deps import get_current_admin_user, get_current_super_admin_user
+from app.core.security import get_password_hash
+from app.models.user import User, UserRole
+from app.models.gym import Gym
+from app.models.membership import GymMembership
+from app.models.subscription import Subscription
+from app.models.transaction import Transaction, TransactionStatus
+from app.schemas.user import User as UserSchema, AdminInvite
+
+router = APIRouter()
+
+
+@router.get("/users", response_model=List[UserSchema])
+def get_all_users(
+    skip: int = 0,
+    limit: int = 100,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_admin_user),
+):
+    users = db.query(User).offset(skip).limit(limit).all()
+    return users
+
+
+@router.get("/users/{user_id}", response_model=UserSchema)
+def get_user_by_id(
+    user_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_admin_user),
+):
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    return user
+
+
+@router.get("/users/{user_id}/subscriptions")
+def get_user_subscriptions(
+    user_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_admin_user),
+):
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    subscriptions = db.query(Subscription).filter(Subscription.user_id == user_id).all()
+    return subscriptions
+
+
+@router.get("/users/{user_id}/transactions")
+def get_user_transactions(
+    user_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(
+        get_current_super_admin_user
+    ),  # Only super admin can view financial data
+):
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    transactions = db.query(Transaction).filter(Transaction.user_id == user_id).all()
+    return transactions
+
+
+@router.get("/stats/overview")
+def get_overview_stats(
+    db: Session = Depends(get_db), current_user: User = Depends(get_current_admin_user)
+):
+    total_users = (
+        db.query(func.count(User.id)).filter(User.role == UserRole.USER).scalar()
+    )
+    total_gyms = db.query(func.count(Gym.id)).filter(Gym.is_active).scalar()
+    total_memberships = db.query(func.count(GymMembership.id)).scalar()
+    active_subscriptions = (
+        db.query(func.count(Subscription.id))
+        .filter(Subscription.status == "active")
+        .scalar()
+    )
+
+    return {
+        "total_users": total_users,
+        "total_gyms": total_gyms,
+        "total_memberships": total_memberships,
+        "active_subscriptions": active_subscriptions,
+    }
+
+
+@router.get("/stats/financial")
+def get_financial_stats(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(
+        get_current_super_admin_user
+    ),  # Only super admin can view financial data
+):
+    total_revenue = (
+        db.query(func.sum(Transaction.amount))
+        .filter(Transaction.status == TransactionStatus.COMPLETED)
+        .scalar()
+        or 0
+    )
+
+    pending_revenue = (
+        db.query(func.sum(Transaction.amount))
+        .filter(Transaction.status == TransactionStatus.PENDING)
+        .scalar()
+        or 0
+    )
+
+    failed_transactions = (
+        db.query(func.count(Transaction.id))
+        .filter(Transaction.status == TransactionStatus.FAILED)
+        .scalar()
+    )
+
+    return {
+        "total_revenue": total_revenue,
+        "pending_revenue": pending_revenue,
+        "failed_transactions": failed_transactions,
+    }
+
+
+@router.get("/transactions")
+def get_all_transactions(
+    skip: int = 0,
+    limit: int = 100,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(
+        get_current_super_admin_user
+    ),  # Only super admin can view all transactions
+):
+    transactions = db.query(Transaction).offset(skip).limit(limit).all()
+    return transactions
+
+
+@router.post("/invite-admin")
+def invite_admin(
+    admin_data: AdminInvite,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(
+        get_current_super_admin_user
+    ),  # Only super admin can invite admins
+):
+    existing_user = db.query(User).filter(User.email == admin_data.email).first()
+    if existing_user:
+        raise HTTPException(
+            status_code=400, detail="User with this email already exists"
+        )
+
+    if admin_data.role == UserRole.SUPER_ADMIN:
+        raise HTTPException(status_code=400, detail="Cannot invite super admin")
+
+    # Generate a temporary password (in production, send via email)
+    temp_password = (
+        "TempPass123!"  # In production, generate random password and send via email
+    )
+    hashed_password = get_password_hash(temp_password)
+
+    new_admin = User(
+        email=admin_data.email,
+        full_name=admin_data.full_name,
+        role=admin_data.role,
+        hashed_password=hashed_password,
+        invited_by=current_user.id,
+    )
+
+    db.add(new_admin)
+    db.commit()
+    db.refresh(new_admin)
+
+    return {
+        "message": "Admin invited successfully",
+        "admin_id": new_admin.id,
+        "temporary_password": temp_password,  # In production, don't return this
+    }
+
+
+@router.delete("/remove-admin/{admin_id}")
+def remove_admin(
+    admin_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(
+        get_current_super_admin_user
+    ),  # Only super admin can remove admins
+):
+    admin = (
+        db.query(User)
+        .filter(
+            User.id == admin_id, User.role.in_([UserRole.ADMIN, UserRole.SUPER_ADMIN])
+        )
+        .first()
+    )
+
+    if not admin:
+        raise HTTPException(status_code=404, detail="Admin not found")
+
+    if admin.role == UserRole.SUPER_ADMIN:
+        raise HTTPException(status_code=400, detail="Cannot remove super admin")
+
+    admin.is_active = False
+    db.commit()
+
+    return {"message": "Admin removed successfully"}
+
+
+@router.get("/admins")
+def get_all_admins(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_super_admin_user),
+):
+    admins = (
+        db.query(User)
+        .filter(User.role.in_([UserRole.ADMIN, UserRole.SUPER_ADMIN]))
+        .all()
+    )
+    return admins
--- a/app/api/v1/endpoints/auth.py
+++ b/app/api/v1/endpoints/auth.py
@ -0,0 +1,54 @@
+from datetime import timedelta
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.core import security
+from app.core.config import settings
+from app.models.user import User
+from app.schemas.user import Token, UserCreate, User as UserSchema, UserLogin
+
+router = APIRouter()
+
+
+@router.post("/register", response_model=UserSchema)
+def register(user_data: UserCreate, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.email == user_data.email).first()
+    if db_user:
+        raise HTTPException(status_code=400, detail="Email already registered")
+
+    hashed_password = security.get_password_hash(user_data.password)
+    db_user = User(
+        email=user_data.email,
+        full_name=user_data.full_name,
+        phone=user_data.phone,
+        hashed_password=hashed_password,
+    )
+    db.add(db_user)
+    db.commit()
+    db.refresh(db_user)
+    return db_user
+
+
+@router.post("/login", response_model=Token)
+def login(user_credentials: UserLogin, db: Session = Depends(get_db)):
+    user = db.query(User).filter(User.email == user_credentials.email).first()
+
+    if not user or not security.verify_password(
+        user_credentials.password, user.hashed_password
+    ):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    if not user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = security.create_access_token(
+        data={"sub": user.email}, expires_delta=access_token_expires
+    )
+
+    return {"access_token": access_token, "token_type": "bearer"}
--- a/app/api/v1/endpoints/gyms.py
+++ b/app/api/v1/endpoints/gyms.py
@ -0,0 +1,102 @@
+from typing import List
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.core.deps import get_current_active_user, get_current_admin_user
+from app.models.gym import Gym
+from app.models.membership import GymMembership, MembershipPlan
+from app.models.user import User
+from app.schemas.gym import Gym as GymSchema, GymCreate, GymUpdate
+from app.schemas.membership import GymMembership as GymMembershipSchema
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[GymSchema])
+def read_gyms(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
+    gyms = db.query(Gym).filter(Gym.is_active).offset(skip).limit(limit).all()
+    return gyms
+
+
+@router.get("/{gym_id}", response_model=GymSchema)
+def read_gym(gym_id: int, db: Session = Depends(get_db)):
+    gym = db.query(Gym).filter(Gym.id == gym_id, Gym.is_active).first()
+    if not gym:
+        raise HTTPException(status_code=404, detail="Gym not found")
+    return gym
+
+
+@router.get("/{gym_id}/membership-plans")
+def get_gym_membership_plans(gym_id: int, db: Session = Depends(get_db)):
+    gym = db.query(Gym).filter(Gym.id == gym_id, Gym.is_active).first()
+    if not gym:
+        raise HTTPException(status_code=404, detail="Gym not found")
+
+    plans = (
+        db.query(MembershipPlan)
+        .filter(MembershipPlan.gym_id == gym_id, MembershipPlan.is_active)
+        .all()
+    )
+    return plans
+
+
+@router.post("/{gym_id}/join", response_model=GymMembershipSchema)
+def join_gym(
+    gym_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    gym = db.query(Gym).filter(Gym.id == gym_id, Gym.is_active).first()
+    if not gym:
+        raise HTTPException(status_code=404, detail="Gym not found")
+
+    existing_membership = (
+        db.query(GymMembership)
+        .filter(
+            GymMembership.user_id == current_user.id, GymMembership.gym_id == gym_id
+        )
+        .first()
+    )
+
+    if existing_membership:
+        raise HTTPException(status_code=400, detail="Already a member of this gym")
+
+    membership = GymMembership(user_id=current_user.id, gym_id=gym_id)
+    db.add(membership)
+    db.commit()
+    db.refresh(membership)
+    return membership
+
+
+@router.post("/", response_model=GymSchema)
+def create_gym(
+    gym_data: GymCreate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_admin_user),
+):
+    gym = Gym(**gym_data.dict())
+    db.add(gym)
+    db.commit()
+    db.refresh(gym)
+    return gym
+
+
+@router.put("/{gym_id}", response_model=GymSchema)
+def update_gym(
+    gym_id: int,
+    gym_update: GymUpdate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_admin_user),
+):
+    gym = db.query(Gym).filter(Gym.id == gym_id).first()
+    if not gym:
+        raise HTTPException(status_code=404, detail="Gym not found")
+
+    update_data = gym_update.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(gym, field, value)
+
+    db.commit()
+    db.refresh(gym)
+    return gym
--- a/app/api/v1/endpoints/memberships.py
+++ b/app/api/v1/endpoints/memberships.py
@ -0,0 +1,93 @@
+from typing import List
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.core.deps import get_current_admin_user
+from app.models.membership import MembershipPlan
+from app.models.gym import Gym
+from app.schemas.membership import (
+    MembershipPlan as MembershipPlanSchema,
+    MembershipPlanCreate,
+    MembershipPlanUpdate,
+)
+
+router = APIRouter()
+
+
+@router.get("/plans", response_model=List[MembershipPlanSchema])
+def read_membership_plans(
+    skip: int = 0, limit: int = 100, db: Session = Depends(get_db)
+):
+    plans = (
+        db.query(MembershipPlan)
+        .filter(MembershipPlan.is_active)
+        .offset(skip)
+        .limit(limit)
+        .all()
+    )
+    return plans
+
+
+@router.get("/plans/{plan_id}", response_model=MembershipPlanSchema)
+def read_membership_plan(plan_id: int, db: Session = Depends(get_db)):
+    plan = (
+        db.query(MembershipPlan)
+        .filter(MembershipPlan.id == plan_id, MembershipPlan.is_active)
+        .first()
+    )
+    if not plan:
+        raise HTTPException(status_code=404, detail="Membership plan not found")
+    return plan
+
+
+@router.post("/plans", response_model=MembershipPlanSchema)
+def create_membership_plan(
+    plan_data: MembershipPlanCreate,
+    db: Session = Depends(get_db),
+    current_user=Depends(get_current_admin_user),
+):
+    gym = db.query(Gym).filter(Gym.id == plan_data.gym_id, Gym.is_active).first()
+    if not gym:
+        raise HTTPException(status_code=404, detail="Gym not found")
+
+    plan = MembershipPlan(**plan_data.dict())
+    db.add(plan)
+    db.commit()
+    db.refresh(plan)
+    return plan
+
+
+@router.put("/plans/{plan_id}", response_model=MembershipPlanSchema)
+def update_membership_plan(
+    plan_id: int,
+    plan_update: MembershipPlanUpdate,
+    db: Session = Depends(get_db),
+    current_user=Depends(get_current_admin_user),
+):
+    plan = db.query(MembershipPlan).filter(MembershipPlan.id == plan_id).first()
+    if not plan:
+        raise HTTPException(status_code=404, detail="Membership plan not found")
+
+    update_data = plan_update.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(plan, field, value)
+
+    db.commit()
+    db.refresh(plan)
+    return plan
+
+
+@router.delete("/plans/{plan_id}")
+def delete_membership_plan(
+    plan_id: int,
+    db: Session = Depends(get_db),
+    current_user=Depends(get_current_admin_user),
+):
+    plan = db.query(MembershipPlan).filter(MembershipPlan.id == plan_id).first()
+    if not plan:
+        raise HTTPException(status_code=404, detail="Membership plan not found")
+
+    plan.is_active = False
+    db.commit()
+    return {"message": "Membership plan deactivated successfully"}
--- a/app/api/v1/endpoints/payments.py
+++ b/app/api/v1/endpoints/payments.py
@ -0,0 +1,181 @@
+from fastapi import APIRouter, Depends, HTTPException, BackgroundTasks
+from sqlalchemy.orm import Session
+from datetime import datetime, timedelta
+
+from app.db.session import get_db
+from app.core.deps import get_current_active_user
+from app.models.user import User
+from app.models.membership import MembershipPlan
+from app.models.subscription import Subscription, SubscriptionStatus
+from app.models.transaction import Transaction, TransactionStatus
+from app.schemas.transaction import PaymentRequest, Transaction as TransactionSchema
+from app.services.payment import payment_service
+
+router = APIRouter()
+
+
+@router.post("/initialize")
+def initialize_payment(
+    payment_request: PaymentRequest,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    plan = (
+        db.query(MembershipPlan)
+        .filter(
+            MembershipPlan.id == payment_request.membership_plan_id,
+            MembershipPlan.is_active,
+        )
+        .first()
+    )
+    if not plan:
+        raise HTTPException(status_code=404, detail="Membership plan not found")
+
+    existing_active_subscription = (
+        db.query(Subscription)
+        .filter(
+            Subscription.user_id == current_user.id,
+            Subscription.membership_plan_id == payment_request.membership_plan_id,
+            Subscription.status == SubscriptionStatus.ACTIVE,
+        )
+        .first()
+    )
+
+    if existing_active_subscription:
+        raise HTTPException(
+            status_code=400, detail="Active subscription already exists for this plan"
+        )
+
+    # Create transaction record
+    transaction = Transaction(
+        user_id=current_user.id,
+        amount=plan.price,
+        payment_gateway=payment_request.payment_gateway,
+        description=f"Subscription to {plan.name}",
+    )
+    db.add(transaction)
+    db.commit()
+    db.refresh(transaction)
+
+    metadata = {
+        "user_id": str(current_user.id),
+        "transaction_id": str(transaction.id),
+        "plan_id": str(plan.id),
+    }
+
+    try:
+        payment_data = payment_service.initialize_payment(
+            gateway=payment_request.payment_gateway,
+            amount=plan.price,
+            currency="USD"
+            if payment_request.payment_gateway.value == "stripe"
+            else "NGN",
+            email=current_user.email,
+            metadata=metadata,
+        )
+
+        # Update transaction with gateway reference
+        if payment_request.payment_gateway.value == "stripe":
+            transaction.gateway_reference = payment_data.get("payment_intent_id")
+        else:
+            transaction.gateway_reference = payment_data.get("reference")
+
+        db.commit()
+
+        return {"transaction_id": transaction.id, "payment_data": payment_data}
+    except Exception as e:
+        transaction.status = TransactionStatus.FAILED
+        db.commit()
+        raise e
+
+
+@router.post("/verify/{transaction_id}")
+def verify_payment(
+    transaction_id: int,
+    background_tasks: BackgroundTasks,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    transaction = (
+        db.query(Transaction)
+        .filter(
+            Transaction.id == transaction_id, Transaction.user_id == current_user.id
+        )
+        .first()
+    )
+    if not transaction:
+        raise HTTPException(status_code=404, detail="Transaction not found")
+
+    if transaction.status == TransactionStatus.COMPLETED:
+        return {"message": "Payment already verified"}
+
+    try:
+        verification_data = payment_service.verify_payment(
+            gateway=transaction.payment_gateway, reference=transaction.gateway_reference
+        )
+
+        if verification_data["status"] in ["succeeded", "success"]:
+            transaction.status = TransactionStatus.COMPLETED
+            transaction.gateway_transaction_id = verification_data.get(
+                "reference"
+            ) or verification_data.get("payment_intent_id")
+
+            # Create subscription
+            plan = (
+                db.query(MembershipPlan)
+                .filter(MembershipPlan.id == transaction.subscription_id)
+                .first()
+            )
+            if not plan:
+                # Find plan from metadata or transaction description
+                # This is a fallback - ideally we'd store plan_id in transaction
+                raise HTTPException(
+                    status_code=500, detail="Cannot create subscription: plan not found"
+                )
+
+            start_date = datetime.utcnow()
+            end_date = start_date + timedelta(days=plan.duration_days)
+
+            subscription = Subscription(
+                user_id=current_user.id,
+                membership_plan_id=plan.id,
+                start_date=start_date,
+                end_date=end_date,
+                amount_paid=transaction.amount,
+                payment_reference=transaction.gateway_reference,
+                status=SubscriptionStatus.ACTIVE,
+            )
+
+            transaction.subscription_id = subscription.id
+            db.add(subscription)
+            db.commit()
+
+            return {"message": "Payment verified and subscription created successfully"}
+        else:
+            transaction.status = TransactionStatus.FAILED
+            db.commit()
+            raise HTTPException(status_code=400, detail="Payment verification failed")
+
+    except Exception as e:
+        transaction.status = TransactionStatus.FAILED
+        db.commit()
+        raise HTTPException(
+            status_code=400, detail=f"Payment verification error: {str(e)}"
+        )
+
+
+@router.get("/transactions", response_model=list[TransactionSchema])
+def get_user_transactions(
+    skip: int = 0,
+    limit: int = 100,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    transactions = (
+        db.query(Transaction)
+        .filter(Transaction.user_id == current_user.id)
+        .offset(skip)
+        .limit(limit)
+        .all()
+    )
+    return transactions
--- a/app/api/v1/endpoints/subscriptions.py
+++ b/app/api/v1/endpoints/subscriptions.py
@ -0,0 +1,148 @@
+from typing import List
+from datetime import datetime, timedelta
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.core.deps import get_current_active_user, get_current_admin_user
+from app.models.subscription import Subscription, SubscriptionStatus
+from app.models.membership import MembershipPlan
+from app.models.user import User
+from app.schemas.subscription import (
+    Subscription as SubscriptionSchema,
+    SubscriptionCreate,
+    SubscriptionUpdate,
+)
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[SubscriptionSchema])
+def read_subscriptions(
+    skip: int = 0,
+    limit: int = 100,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    subscriptions = (
+        db.query(Subscription)
+        .filter(Subscription.user_id == current_user.id)
+        .offset(skip)
+        .limit(limit)
+        .all()
+    )
+    return subscriptions
+
+
+@router.get("/{subscription_id}", response_model=SubscriptionSchema)
+def read_subscription(
+    subscription_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    subscription = (
+        db.query(Subscription)
+        .filter(
+            Subscription.id == subscription_id, Subscription.user_id == current_user.id
+        )
+        .first()
+    )
+    if not subscription:
+        raise HTTPException(status_code=404, detail="Subscription not found")
+    return subscription
+
+
+@router.post("/", response_model=SubscriptionSchema)
+def create_subscription(
+    subscription_data: SubscriptionCreate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    plan = (
+        db.query(MembershipPlan)
+        .filter(
+            MembershipPlan.id == subscription_data.membership_plan_id,
+            MembershipPlan.is_active,
+        )
+        .first()
+    )
+    if not plan:
+        raise HTTPException(status_code=404, detail="Membership plan not found")
+
+    existing_active_subscription = (
+        db.query(Subscription)
+        .filter(
+            Subscription.user_id == current_user.id,
+            Subscription.membership_plan_id == subscription_data.membership_plan_id,
+            Subscription.status == SubscriptionStatus.ACTIVE,
+        )
+        .first()
+    )
+
+    if existing_active_subscription:
+        raise HTTPException(
+            status_code=400, detail="Active subscription already exists for this plan"
+        )
+
+    start_date = datetime.utcnow()
+    end_date = start_date + timedelta(days=plan.duration_days)
+
+    subscription = Subscription(
+        user_id=current_user.id,
+        membership_plan_id=subscription_data.membership_plan_id,
+        start_date=start_date,
+        end_date=end_date,
+        amount_paid=plan.price,
+        status=SubscriptionStatus.PENDING,
+    )
+
+    db.add(subscription)
+    db.commit()
+    db.refresh(subscription)
+    return subscription
+
+
+@router.put("/{subscription_id}", response_model=SubscriptionSchema)
+def update_subscription(
+    subscription_id: int,
+    subscription_update: SubscriptionUpdate,
+    db: Session = Depends(get_db),
+    current_user=Depends(get_current_admin_user),
+):
+    subscription = (
+        db.query(Subscription).filter(Subscription.id == subscription_id).first()
+    )
+    if not subscription:
+        raise HTTPException(status_code=404, detail="Subscription not found")
+
+    update_data = subscription_update.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(subscription, field, value)
+
+    db.commit()
+    db.refresh(subscription)
+    return subscription
+
+
+@router.post("/{subscription_id}/cancel")
+def cancel_subscription(
+    subscription_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    subscription = (
+        db.query(Subscription)
+        .filter(
+            Subscription.id == subscription_id, Subscription.user_id == current_user.id
+        )
+        .first()
+    )
+    if not subscription:
+        raise HTTPException(status_code=404, detail="Subscription not found")
+
+    if subscription.status == SubscriptionStatus.CANCELLED:
+        raise HTTPException(status_code=400, detail="Subscription already cancelled")
+
+    subscription.status = SubscriptionStatus.CANCELLED
+    db.commit()
+    return {"message": "Subscription cancelled successfully"}
--- a/app/api/v1/endpoints/users.py
+++ b/app/api/v1/endpoints/users.py
@ -0,0 +1,55 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.core.deps import get_current_active_user
+from app.models.user import User
+from app.models.membership import GymMembership
+from app.models.subscription import Subscription
+from app.schemas.user import User as UserSchema, UserUpdate
+
+router = APIRouter()
+
+
+@router.get("/me", response_model=UserSchema)
+def read_user_me(current_user: User = Depends(get_current_active_user)):
+    return current_user
+
+
+@router.put("/me", response_model=UserSchema)
+def update_user_me(
+    user_update: UserUpdate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+):
+    user = db.query(User).filter(User.id == current_user.id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    update_data = user_update.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(user, field, value)
+
+    db.commit()
+    db.refresh(user)
+    return user
+
+
+@router.get("/me/memberships")
+def get_user_memberships(
+    db: Session = Depends(get_db), current_user: User = Depends(get_current_active_user)
+):
+    memberships = (
+        db.query(GymMembership).filter(GymMembership.user_id == current_user.id).all()
+    )
+    return memberships
+
+
+@router.get("/me/subscriptions")
+def get_user_subscriptions(
+    db: Session = Depends(get_db), current_user: User = Depends(get_current_active_user)
+):
+    subscriptions = (
+        db.query(Subscription).filter(Subscription.user_id == current_user.id).all()
+    )
+    return subscriptions
--- a/app/api/v1/router.py
+++ b/app/api/v1/router.py
@ -0,0 +1,25 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import (
+    auth,
+    users,
+    gyms,
+    memberships,
+    subscriptions,
+    payments,
+    admin,
+)
+
+api_router = APIRouter()
+
+api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])
+api_router.include_router(gyms.router, prefix="/gyms", tags=["gyms"])
+api_router.include_router(
+    memberships.router, prefix="/memberships", tags=["memberships"]
+)
+api_router.include_router(
+    subscriptions.router, prefix="/subscriptions", tags=["subscriptions"]
+)
+api_router.include_router(payments.router, prefix="/payments", tags=["payments"])
+api_router.include_router(admin.router, prefix="/admin", tags=["admin"])
--- a/app/core/init.py
+++ b/app/core/init.py
--- a/app/core/config.py
+++ b/app/core/config.py
@ -0,0 +1,21 @@
+import os
+from typing import Optional
+
+
+class Settings:
+    PROJECT_NAME: str = "Gym Membership Management System"
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "your-secret-key-change-in-production")
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+
+    # Database
+    DATABASE_URL: str = "sqlite:////app/storage/db/db.sqlite"
+
+    # Payment Gateways
+    STRIPE_SECRET_KEY: Optional[str] = os.getenv("STRIPE_SECRET_KEY")
+    STRIPE_PUBLISHABLE_KEY: Optional[str] = os.getenv("STRIPE_PUBLISHABLE_KEY")
+    PAYSTACK_SECRET_KEY: Optional[str] = os.getenv("PAYSTACK_SECRET_KEY")
+    PAYSTACK_PUBLIC_KEY: Optional[str] = os.getenv("PAYSTACK_PUBLIC_KEY")
+
+
+settings = Settings()
--- a/app/core/deps.py
+++ b/app/core/deps.py
@ -0,0 +1,58 @@
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.core.security import verify_token
+from app.models.user import User, UserRole
+
+security = HTTPBearer()
+
+
+def get_current_user(
+    db: Session = Depends(get_db),
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    token = credentials.credentials
+    email = verify_token(token)
+
+    if email is None:
+        raise credentials_exception
+
+    user = db.query(User).filter(User.email == email).first()
+    if user is None:
+        raise credentials_exception
+
+    return user
+
+
+def get_current_active_user(current_user: User = Depends(get_current_user)) -> User:
+    if not current_user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user
+
+
+def get_current_admin_user(
+    current_user: User = Depends(get_current_active_user),
+) -> User:
+    if current_user.role not in [UserRole.ADMIN, UserRole.SUPER_ADMIN]:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN, detail="Not enough permissions"
+        )
+    return current_user
+
+
+def get_current_super_admin_user(
+    current_user: User = Depends(get_current_active_user),
+) -> User:
+    if current_user.role != UserRole.SUPER_ADMIN:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN, detail="Super admin access required"
+        )
+    return current_user
--- a/app/core/security.py
+++ b/app/core/security.py
@ -0,0 +1,43 @@
+from datetime import datetime, timedelta
+from typing import Optional, Union
+from passlib.context import CryptContext
+from jose import JWTError, jwt
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(
+            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
+        )
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(
+        to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM
+    )
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def verify_token(token: str) -> Union[str, None]:
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
+        )
+        email: str = payload.get("sub")
+        if email is None:
+            return None
+        return email
+    except JWTError:
+        return None
--- a/app/db/init.py
+++ b/app/db/init.py
--- a/app/db/base.py
+++ b/app/db/base.py
@ -0,0 +1,3 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()
--- a/app/db/session.py
+++ b/app/db/session.py
@ -0,0 +1,22 @@
+from pathlib import Path
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+DB_DIR = Path("/app/storage/db")
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
--- a/app/models/init.py
+++ b/app/models/init.py
--- a/app/models/gym.py
+++ b/app/models/gym.py
@ -0,0 +1,24 @@
+from sqlalchemy import Column, Integer, String, DateTime, Text, Boolean
+from sqlalchemy.orm import relationship
+from datetime import datetime
+
+from app.db.base import Base
+
+
+class Gym(Base):
+    __tablename__ = "gyms"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, nullable=False, index=True)
+    description = Column(Text, nullable=True)
+    address = Column(String, nullable=False)
+    city = Column(String, nullable=False)
+    state = Column(String, nullable=False)
+    phone = Column(String, nullable=True)
+    email = Column(String, nullable=True)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    membership_plans = relationship("MembershipPlan", back_populates="gym")
+    gym_memberships = relationship("GymMembership", back_populates="gym")
--- a/app/models/membership.py
+++ b/app/models/membership.py
@ -0,0 +1,62 @@
+from sqlalchemy import (
+    Column,
+    Integer,
+    String,
+    DateTime,
+    Float,
+    ForeignKey,
+    Boolean,
+    Enum,
+    Text,
+)
+from sqlalchemy.orm import relationship
+from datetime import datetime
+import enum
+
+from app.db.base import Base
+
+
+class PlanType(str, enum.Enum):
+    BASIC = "basic"
+    PREMIUM = "premium"
+    VIP = "vip"
+
+
+class MembershipStatus(str, enum.Enum):
+    ACTIVE = "active"
+    INACTIVE = "inactive"
+    EXPIRED = "expired"
+    SUSPENDED = "suspended"
+
+
+class MembershipPlan(Base):
+    __tablename__ = "membership_plans"
+
+    id = Column(Integer, primary_key=True, index=True)
+    gym_id = Column(Integer, ForeignKey("gyms.id"), nullable=False)
+    name = Column(String, nullable=False)
+    description = Column(Text, nullable=True)
+    plan_type = Column(Enum(PlanType), nullable=False)
+    price = Column(Float, nullable=False)
+    duration_days = Column(Integer, nullable=False)
+    features = Column(Text, nullable=True)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    gym = relationship("Gym", back_populates="membership_plans")
+    subscriptions = relationship("Subscription", back_populates="membership_plan")
+
+
+class GymMembership(Base):
+    __tablename__ = "gym_memberships"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    gym_id = Column(Integer, ForeignKey("gyms.id"), nullable=False)
+    status = Column(Enum(MembershipStatus), default=MembershipStatus.ACTIVE)
+    joined_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    user = relationship("User", back_populates="gym_memberships")
+    gym = relationship("Gym", back_populates="gym_memberships")
--- a/app/models/subscription.py
+++ b/app/models/subscription.py
@ -0,0 +1,34 @@
+from sqlalchemy import Column, Integer, DateTime, ForeignKey, Float, Enum, String
+from sqlalchemy.orm import relationship
+from datetime import datetime
+import enum
+
+from app.db.base import Base
+
+
+class SubscriptionStatus(str, enum.Enum):
+    ACTIVE = "active"
+    EXPIRED = "expired"
+    CANCELLED = "cancelled"
+    PENDING = "pending"
+
+
+class Subscription(Base):
+    __tablename__ = "subscriptions"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    membership_plan_id = Column(
+        Integer, ForeignKey("membership_plans.id"), nullable=False
+    )
+    status = Column(Enum(SubscriptionStatus), default=SubscriptionStatus.PENDING)
+    start_date = Column(DateTime, nullable=False)
+    end_date = Column(DateTime, nullable=False)
+    amount_paid = Column(Float, nullable=False)
+    payment_reference = Column(String, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    user = relationship("User", back_populates="subscriptions")
+    membership_plan = relationship("MembershipPlan", back_populates="subscriptions")
+    transactions = relationship("Transaction", back_populates="subscription")
--- a/app/models/transaction.py
+++ b/app/models/transaction.py
@ -0,0 +1,38 @@
+from sqlalchemy import Column, Integer, String, DateTime, Float, ForeignKey, Enum, Text
+from sqlalchemy.orm import relationship
+from datetime import datetime
+import enum
+
+from app.db.base import Base
+
+
+class TransactionStatus(str, enum.Enum):
+    PENDING = "pending"
+    COMPLETED = "completed"
+    FAILED = "failed"
+    REFUNDED = "refunded"
+
+
+class PaymentGateway(str, enum.Enum):
+    STRIPE = "stripe"
+    PAYSTACK = "paystack"
+
+
+class Transaction(Base):
+    __tablename__ = "transactions"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    subscription_id = Column(Integer, ForeignKey("subscriptions.id"), nullable=True)
+    amount = Column(Float, nullable=False)
+    currency = Column(String, default="USD", nullable=False)
+    status = Column(Enum(TransactionStatus), default=TransactionStatus.PENDING)
+    payment_gateway = Column(Enum(PaymentGateway), nullable=False)
+    gateway_transaction_id = Column(String, nullable=True)
+    gateway_reference = Column(String, nullable=True)
+    description = Column(Text, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    user = relationship("User", back_populates="transactions")
+    subscription = relationship("Subscription", back_populates="transactions")
--- a/app/models/user.py
+++ b/app/models/user.py
@ -0,0 +1,31 @@
+from sqlalchemy import Column, Integer, String, DateTime, Boolean, Enum
+from sqlalchemy.orm import relationship
+from datetime import datetime
+import enum
+
+from app.db.base import Base
+
+
+class UserRole(str, enum.Enum):
+    USER = "user"
+    ADMIN = "admin"
+    SUPER_ADMIN = "super_admin"
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    full_name = Column(String, nullable=False)
+    phone = Column(String, nullable=True)
+    hashed_password = Column(String, nullable=False)
+    role = Column(Enum(UserRole), default=UserRole.USER, nullable=False)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    gym_memberships = relationship("GymMembership", back_populates="user")
+    subscriptions = relationship("Subscription", back_populates="user")
+    transactions = relationship("Transaction", back_populates="user")
+    invited_by = Column(Integer, nullable=True)
--- a/app/schemas/init.py
+++ b/app/schemas/init.py
--- a/app/schemas/gym.py
+++ b/app/schemas/gym.py
@ -0,0 +1,41 @@
+from pydantic import BaseModel, EmailStr
+from typing import Optional
+from datetime import datetime
+
+
+class GymBase(BaseModel):
+    name: str
+    description: Optional[str] = None
+    address: str
+    city: str
+    state: str
+    phone: Optional[str] = None
+    email: Optional[EmailStr] = None
+
+
+class GymCreate(GymBase):
+    pass
+
+
+class GymUpdate(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    address: Optional[str] = None
+    city: Optional[str] = None
+    state: Optional[str] = None
+    phone: Optional[str] = None
+    email: Optional[EmailStr] = None
+
+
+class GymInDB(GymBase):
+    id: int
+    is_active: bool
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class Gym(GymInDB):
+    pass
--- a/app/schemas/membership.py
+++ b/app/schemas/membership.py
@ -0,0 +1,64 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from app.models.membership import PlanType, MembershipStatus
+
+
+class MembershipPlanBase(BaseModel):
+    name: str
+    description: Optional[str] = None
+    plan_type: PlanType
+    price: float
+    duration_days: int
+    features: Optional[str] = None
+
+
+class MembershipPlanCreate(MembershipPlanBase):
+    gym_id: int
+
+
+class MembershipPlanUpdate(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    plan_type: Optional[PlanType] = None
+    price: Optional[float] = None
+    duration_days: Optional[int] = None
+    features: Optional[str] = None
+
+
+class MembershipPlanInDB(MembershipPlanBase):
+    id: int
+    gym_id: int
+    is_active: bool
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class MembershipPlan(MembershipPlanInDB):
+    pass
+
+
+class GymMembershipBase(BaseModel):
+    user_id: int
+    gym_id: int
+
+
+class GymMembershipCreate(GymMembershipBase):
+    pass
+
+
+class GymMembershipInDB(GymMembershipBase):
+    id: int
+    status: MembershipStatus
+    joined_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class GymMembership(GymMembershipInDB):
+    pass
--- a/app/schemas/subscription.py
+++ b/app/schemas/subscription.py
@ -0,0 +1,36 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from app.models.subscription import SubscriptionStatus
+
+
+class SubscriptionBase(BaseModel):
+    membership_plan_id: int
+    start_date: datetime
+    end_date: datetime
+    amount_paid: float
+
+
+class SubscriptionCreate(SubscriptionBase):
+    user_id: int
+
+
+class SubscriptionUpdate(BaseModel):
+    status: Optional[SubscriptionStatus] = None
+    end_date: Optional[datetime] = None
+
+
+class SubscriptionInDB(SubscriptionBase):
+    id: int
+    user_id: int
+    status: SubscriptionStatus
+    payment_reference: Optional[str] = None
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class Subscription(SubscriptionInDB):
+    pass
--- a/app/schemas/transaction.py
+++ b/app/schemas/transaction.py
@ -0,0 +1,45 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from app.models.transaction import TransactionStatus, PaymentGateway
+
+
+class TransactionBase(BaseModel):
+    amount: float
+    currency: str = "USD"
+    payment_gateway: PaymentGateway
+    description: Optional[str] = None
+
+
+class TransactionCreate(TransactionBase):
+    user_id: int
+    subscription_id: Optional[int] = None
+
+
+class TransactionUpdate(BaseModel):
+    status: Optional[TransactionStatus] = None
+    gateway_transaction_id: Optional[str] = None
+    gateway_reference: Optional[str] = None
+
+
+class TransactionInDB(TransactionBase):
+    id: int
+    user_id: int
+    subscription_id: Optional[int] = None
+    status: TransactionStatus
+    gateway_transaction_id: Optional[str] = None
+    gateway_reference: Optional[str] = None
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class Transaction(TransactionInDB):
+    pass
+
+
+class PaymentRequest(BaseModel):
+    membership_plan_id: int
+    payment_gateway: PaymentGateway
--- a/app/schemas/user.py
+++ b/app/schemas/user.py
@ -0,0 +1,54 @@
+from pydantic import BaseModel, EmailStr
+from typing import Optional
+from datetime import datetime
+from app.models.user import UserRole
+
+
+class UserBase(BaseModel):
+    email: EmailStr
+    full_name: str
+    phone: Optional[str] = None
+
+
+class UserCreate(UserBase):
+    password: str
+
+
+class UserUpdate(BaseModel):
+    full_name: Optional[str] = None
+    phone: Optional[str] = None
+
+
+class UserInDB(UserBase):
+    id: int
+    role: UserRole
+    is_active: bool
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class User(UserInDB):
+    pass
+
+
+class UserLogin(BaseModel):
+    email: EmailStr
+    password: str
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenData(BaseModel):
+    email: Optional[str] = None
+
+
+class AdminInvite(BaseModel):
+    email: EmailStr
+    full_name: str
+    role: UserRole = UserRole.ADMIN
--- a/app/services/init.py
+++ b/app/services/init.py
--- a/app/services/payment.py
+++ b/app/services/payment.py
@ -0,0 +1,153 @@
+import stripe
+import requests
+from typing import Dict, Any, Optional
+from fastapi import HTTPException
+
+from app.core.config import settings
+from app.models.transaction import PaymentGateway
+
+
+class StripeService:
+    def __init__(self):
+        if settings.STRIPE_SECRET_KEY:
+            stripe.api_key = settings.STRIPE_SECRET_KEY
+
+    def create_payment_intent(
+        self, amount: float, currency: str = "usd", metadata: Optional[Dict] = None
+    ) -> Dict[str, Any]:
+        if not settings.STRIPE_SECRET_KEY:
+            raise HTTPException(status_code=500, detail="Stripe not configured")
+
+        try:
+            intent = stripe.PaymentIntent.create(
+                amount=int(amount * 100),  # Stripe expects amount in cents
+                currency=currency.lower(),
+                metadata=metadata or {},
+            )
+            return {
+                "client_secret": intent.client_secret,
+                "payment_intent_id": intent.id,
+                "status": intent.status,
+            }
+        except stripe.error.StripeError as e:
+            raise HTTPException(status_code=400, detail=str(e))
+
+    def confirm_payment(self, payment_intent_id: str) -> Dict[str, Any]:
+        if not settings.STRIPE_SECRET_KEY:
+            raise HTTPException(status_code=500, detail="Stripe not configured")
+
+        try:
+            intent = stripe.PaymentIntent.retrieve(payment_intent_id)
+            return {
+                "payment_intent_id": intent.id,
+                "status": intent.status,
+                "amount": intent.amount / 100,  # Convert back from cents
+                "currency": intent.currency,
+            }
+        except stripe.error.StripeError as e:
+            raise HTTPException(status_code=400, detail=str(e))
+
+
+class PaystackService:
+    def __init__(self):
+        self.base_url = "https://api.paystack.co"
+        self.headers = {
+            "Authorization": f"Bearer {settings.PAYSTACK_SECRET_KEY}",
+            "Content-Type": "application/json",
+        }
+
+    def initialize_transaction(
+        self,
+        email: str,
+        amount: float,
+        currency: str = "NGN",
+        metadata: Optional[Dict] = None,
+    ) -> Dict[str, Any]:
+        if not settings.PAYSTACK_SECRET_KEY:
+            raise HTTPException(status_code=500, detail="Paystack not configured")
+
+        data = {
+            "email": email,
+            "amount": int(amount * 100),  # Paystack expects amount in kobo
+            "currency": currency.upper(),
+            "metadata": metadata or {},
+        }
+
+        try:
+            response = requests.post(
+                f"{self.base_url}/transaction/initialize",
+                json=data,
+                headers=self.headers,
+            )
+            response.raise_for_status()
+            result = response.json()
+
+            if result["status"]:
+                return {
+                    "authorization_url": result["data"]["authorization_url"],
+                    "access_code": result["data"]["access_code"],
+                    "reference": result["data"]["reference"],
+                }
+            else:
+                raise HTTPException(status_code=400, detail=result["message"])
+        except requests.RequestException as e:
+            raise HTTPException(status_code=500, detail=f"Paystack API error: {str(e)}")
+
+    def verify_transaction(self, reference: str) -> Dict[str, Any]:
+        if not settings.PAYSTACK_SECRET_KEY:
+            raise HTTPException(status_code=500, detail="Paystack not configured")
+
+        try:
+            response = requests.get(
+                f"{self.base_url}/transaction/verify/{reference}", headers=self.headers
+            )
+            response.raise_for_status()
+            result = response.json()
+
+            if result["status"]:
+                data = result["data"]
+                return {
+                    "reference": data["reference"],
+                    "status": data["status"],
+                    "amount": data["amount"] / 100,  # Convert back from kobo
+                    "currency": data["currency"],
+                    "gateway_response": data["gateway_response"],
+                }
+            else:
+                raise HTTPException(status_code=400, detail=result["message"])
+        except requests.RequestException as e:
+            raise HTTPException(status_code=500, detail=f"Paystack API error: {str(e)}")
+
+
+class PaymentService:
+    def __init__(self):
+        self.stripe_service = StripeService()
+        self.paystack_service = PaystackService()
+
+    def initialize_payment(
+        self,
+        gateway: PaymentGateway,
+        amount: float,
+        currency: str,
+        email: str,
+        metadata: Optional[Dict] = None,
+    ) -> Dict[str, Any]:
+        if gateway == PaymentGateway.STRIPE:
+            return self.stripe_service.create_payment_intent(amount, currency, metadata)
+        elif gateway == PaymentGateway.PAYSTACK:
+            return self.paystack_service.initialize_transaction(
+                email, amount, currency, metadata
+            )
+        else:
+            raise HTTPException(status_code=400, detail="Unsupported payment gateway")
+
+    def verify_payment(self, gateway: PaymentGateway, reference: str) -> Dict[str, Any]:
+        if gateway == PaymentGateway.STRIPE:
+            return self.stripe_service.confirm_payment(reference)
+        elif gateway == PaymentGateway.PAYSTACK:
+            return self.paystack_service.verify_transaction(reference)
+        else:
+            raise HTTPException(status_code=400, detail="Unsupported payment gateway")
+
+
+payment_service = PaymentService()
--- a/main.py
+++ b/main.py
@ -0,0 +1,48 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from contextlib import asynccontextmanager
+
+from app.api.v1.router import api_router
+from app.db.session import engine
+from app.db.base import Base
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    Base.metadata.create_all(bind=engine)
+    yield
+
+
+app = FastAPI(
+    title="Gym Membership Management System",
+    description="A comprehensive platform for gyms to manage member data and subscriptions",
+    version="1.0.0",
+    openapi_url="/openapi.json",
+    lifespan=lifespan,
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(api_router, prefix="/api/v1")
+
+
+@app.get("/")
+async def root():
+    return {
+        "title": "Gym Membership Management System",
+        "description": "A comprehensive platform for gyms to manage member data and subscriptions",
+        "version": "1.0.0",
+        "documentation": "/docs",
+        "health_check": "/health",
+    }
+
+
+@app.get("/health")
+async def health_check():
+    return {"status": "healthy", "service": "gym-membership-api"}
--- a/requirements.txt
+++ b/requirements.txt
@ -0,0 +1,11 @@
+fastapi==0.104.1
+uvicorn[standard]==0.24.0
+sqlalchemy==2.0.23
+alembic==1.13.0
+pydantic[email]==2.5.0
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+python-multipart==0.0.6
+stripe==7.8.0
+requests==2.31.0
+ruff==0.1.6