goktugbati / payment-endpoint-task

To build a project

• Java 11 or newer
• Gradle 7.4 or newer

About default setup

• gradle assemble to initialize a project
• You can start Spring application via your favourite ide or using gradle bootjar and then executing previously created jar
• It uses h2 for db so no need to setup any external database. To access running application db http://localhost:8080/h2-console/login.jsp (login parameters are in application.properties file)
• schema.sql will generate sql tables when Spring application starts
• If you have any problems to run this pre-setup Spring application then feel free to create your own Spring project

Assignment

• Write endpoint POST /payment with JSON body
  • Request json example:

    {
        "senderAccountId": "1",
        "receiverAccountId: "2",
        "amount": "100.00"
    }
    

• Requirements
  • Amount must be a number > 0 and can have two decimal places
  • senderAccountId, receiverAccountId are account table id-s
  • Account balance cannot go negative.
  • Money is withdrawn from sender account and deposited into receiver account
  • And everything else what you think that is important
• Example
  • Before payment
    • Sender account balance 100.00
    • Receiver account balance 100.00
  • Do payment
    • POST /payment

      {
      	"senderAccountId": "1",
      	"receiverAccountId: "2",
      	"amount": "100.00"
      }
      

  • After payment
    • Sender account balance 0.00
    • Receiver account balance 200.00