BillingAPI

A sample Billing API built with ASP.NET Core, demonstrating clean architecture, design patterns and JWT authentication.

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🚀 Run the API

1. Install .NET 9 SDK.
2. Clone the repository.
3. Set BillingApi as Startup project.
4. Run IIS Express.
5. Open Swagger UI: https://localhost:xxxx/swagger.

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🔑 Authentication

1. Login with default user:

   POST /auth/login
   {
     "username": "test",
     "password": "1234"
   }

2. Copy the returned JWT token.
3. In Swagger, click Authorize and paste:

   Bearer <your_token>
   

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📦 Orders API

• POST /orders → Create a new order
• GET /orders/history → View user’s orders and receipts

Gateways:

• paypal → always succeeds
• stripe → always fails

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🧪 Run Tests

dotnet test

Tests cover:

• BillingService (success/failure/validation)
• PaymentGatewayFactory
• In-memory repositories
• User login validation