Payment Gateway

Build Status

Application Info

The payment gateway acts as a intermediary between the merchant and financial institution and providing the status of the payment when requested. Technology used to build this solution are:

• Application -> .NET Core 3.1
• Mock Bank -> Wiremock (http://wiremock.org/)
• Messaging -> RabbitMQ
• Docker

Getting started

Running the app

To get the application running locally follow these steps: Build and start the application in docker compose: docker-compose up -d --build

Request body

This is the stucture of the request that I have assumed is coming from the Merchant.

{
    "Amount": 9.99,
    "Currency": "USD",
    "PaymentMethod": {
        "Type": "Amex",
        "Number": "4111111111111111",
        "ExpirationMonth": "10",
        "ExpirationYear": "20",
        "Cvv": "123"
    
    },
    "MerchantId": "1"
 }

Queues

To access RabbitMQ to view the queue the messages are being published to and consumed from go to:

http://localhost:15672

Testing

I have included a postman collection which includes tests to show the flow of a payment being accepted and declined. Accepted:

• All payment types except Amex
• Status will be Submitted -> Accepted

Declined

• Payment type of Amex (just to show a failure state - in future this would be based on the real response from the bank)
• Status will be Submitted -> Declined

To Do

A list of features I am currently working on adding

• Containerized [x]
• RabbitMQ for event driven architecture [x]
• Build pipeline [x]
• Retry policies for application dependencies
• Logging
  • Serilog would probably be the best choice here for simple logging
• Validation of card details
  • Checking credit card numbers match the type submitted
  • CVV numbers for different providers
  • Expiry date isn't in the past
• Full end-to-end acceptance tests