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Payment Gateway

Build Status

charlawl

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