Serverless Task

Objectives

This is a task aiming to validate basic understanding of :

• AWS services: Lambda/DynamoDB/EventBridge/API Gateway
• Serverless framework

The goal of this task is to create a Payment API. The API takes a Payment as input (see spec below) and propagates it to an event bus (EventBridge). Depending on the paymentSource field of that event, we'll then invoke one of 2 Lambda handlers and store the Payment in a database.

All the code should be in Typescript

Service should be deployable using sls deploy

Requirements

API spec

POST /pay
{
  paymentSource:'client/vendor'
  destination:'orbital'
  currency: 'USD'
  amount: '123.45'
}

Functions

HTTP to Eventbridge

This function takes an API gateway request and sends it to Eventbridge as a PaymentCreated event.

For deduplication purposes, the event should contain the awsRequestId of the API Gateway event.

Alternatively, you may use an API Gateway proxy integration and skip the lambda function.

{
  detail: 'PaymentCreated'
  detail-type: {
    paymentSource:'client/vendor'
    destination:'orbital'
    currency: 'USD'
    amount: '123.45'
    requestId: xxx-yyyy-zzzz
  }
}

Event handler 1 : payment.paymentSource == 'vendor'

On events where source is Orbital, we add a a processedBy:'vendorHandler' field to our payment and save it in a DynamoDB table

Event handler 1 : payment.paymentSource == 'client'

On events where source is client, we add a processedBy:'clientHandler' field to our payment and save it in a DynamoDB table