PaymentGatewayController.java

package com.checkout.payment.gateway.controller;

import com.checkout.payment.gateway.model.GetPaymentResponse;
import com.checkout.payment.gateway.model.PostPaymentRequest;
import com.checkout.payment.gateway.model.PostPaymentResponse;
import com.checkout.payment.gateway.model.ProcessPaymentResult;
import com.checkout.payment.gateway.service.PaymentGatewayService;
import java.util.UUID;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/v1")
public class PaymentGatewayController {

    private final PaymentGatewayService paymentGatewayService;

    public PaymentGatewayController(PaymentGatewayService paymentGatewayService) {
        this.paymentGatewayService = paymentGatewayService;
    }

    @GetMapping("/payments/{id}")
    @PreAuthorize("hasAnyRole('MERCHANT','ADMIN')")
    public ResponseEntity<GetPaymentResponse> getPaymentById(@PathVariable UUID id) {
        return new ResponseEntity<>(paymentGatewayService.getPaymentById(id), HttpStatus.OK);
    }

    @PostMapping("/payments")
    @PreAuthorize("hasAnyRole('MERCHANT','ADMIN')")
    public ResponseEntity<PostPaymentResponse> processPayment(
            @RequestHeader(value = "Idempotency-Key", required = false) String idempotencyKey,
            @RequestBody PostPaymentRequest request) {
        ProcessPaymentResult result = paymentGatewayService.processPayment(idempotencyKey, request);
        return new ResponseEntity<>(
                result.response(),
                HttpStatus.valueOf(result.httpStatusCode()));
    }
}