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

    @Autowired
    private PaymentGatewayService gateway;

    @PostMapping("/process")
    public ResponseEntity<TransactionResponse> processPayment(
            @Valid @RequestBody PaymentRequest req) {
        Transaction tx = gateway.execute(req);
        return ResponseEntity.ok(new TransactionResponse("SUCCESS", tx.getId()));
    }
}