Fintech Payment Service

A FastAPI backend for fintech payment services, providing APIs for users, accounts, and money transfer operations.

Features

• User Management: Create and manage user accounts
• Account Management: Create and manage financial accounts
• Transaction Processing:
  • Send money to external accounts
  • Receive money from external sources
  • Make internal transfers between accounts
  • View transaction history
• Security: JWT authentication for secure API access

Tech Stack

• Framework: FastAPI
• Database: SQLite
• ORM: SQLAlchemy
• Migrations: Alembic
• Authentication: JWT (JSON Web Tokens)
• Password Hashing: Bcrypt

API Endpoints

Authentication

• POST /api/v1/login/access-token - Get access token

Users

• POST /api/v1/users/ - Create a new user
• GET /api/v1/users/me - Get current user info
• PUT /api/v1/users/me - Update current user info
• GET /api/v1/users/{user_id} - Get user by ID

Accounts

• GET /api/v1/accounts/ - List user accounts
• POST /api/v1/accounts/ - Create a new account
• GET /api/v1/accounts/{account_id} - Get account details
• PUT /api/v1/accounts/{account_id} - Update account details
• DELETE /api/v1/accounts/{account_id} - Delete an account

Transactions

• GET /api/v1/transactions/ - List user transactions
• GET /api/v1/transactions/account/{account_id} - List account transactions
• POST /api/v1/transactions/deposit - Create a deposit
• POST /api/v1/transactions/withdrawal - Create a withdrawal
• POST /api/v1/transactions/transfer - Transfer between accounts
• POST /api/v1/transactions/receive - Receive money from external source
• POST /api/v1/transactions/send - Send money to external destination
• GET /api/v1/transactions/{transaction_id} - Get transaction details

Health Check

• GET /api/v1/health - Check API health

Setup Instructions

Prerequisites

• Python 3.8+
• pip

Installation

1. Clone the repository:

   git clone <repository-url>
   cd fintechpaymentservice
   

2. Install dependencies:

   pip install -r requirements.txt
   

3. Set up environment variables:

   # Create a .env file with the following variables
   SECRET_KEY=your_secret_key_here
   ALGORITHM=HS256
   ACCESS_TOKEN_EXPIRE_MINUTES=30
   

4. Run database migrations:

   alembic upgrade head
   

5. Start the server:

   uvicorn main:app --reload
   

6. Access the API documentation:

   • Swagger UI: http://localhost:8000/docs
   • ReDoc: http://localhost:8000/redoc

Usage Examples

Create a User

curl -X POST "http://localhost:8000/api/v1/users/" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "user@example.com",
    "first_name": "John",
    "last_name": "Doe",
    "password": "securepassword"
  }'

Get Access Token

curl -X POST "http://localhost:8000/api/v1/login/access-token" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "username=user@example.com&password=securepassword"

Create an Account

curl -X POST "http://localhost:8000/api/v1/accounts/" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "account_type": "savings",
    "currency": "USD"
  }'

Receive Money

curl -X POST "http://localhost:8000/api/v1/transactions/receive" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "receiver_account_id": 1,
    "external_sender_info": "Bank XYZ - Account 12345",
    "amount": 500.00,
    "currency": "USD",
    "description": "Salary payment"
  }'

Send Money

curl -X POST "http://localhost:8000/api/v1/transactions/send" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "sender_account_id": 1,
    "external_receiver_info": "Bank ABC - Account 67890",
    "amount": 100.00,
    "currency": "USD",
    "description": "Utility bill payment"
  }'

Development

Running Tests

pytest

Code Linting

ruff check .

Code Formatting

ruff format .