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I am trying to test my Spring Boot Java based rest controller to receive Chargebee webhook notifications.

Here is my code:

```

@RestController

@RequestMapping("/no-auth/manager/chargebee/webhook")

public class ChargeBeeWebhook {

    @Autowired

    private AppUserRepository AppUserRepository;

    @Autowired

    private UserManager userManager;

    private Logger logger = LoggerFactory.getLogger(ChargeBeeWebhook.class);

    @PostMapping

    public ResponseEntity<Object> processEvent(@RequestBody Event event) {

        String customerID = event.content().customer().id();

        AppUser AppUser = AppUserRepository.findByChargeBeeCustomerID(customerID);

        if (AppUser == null) {

            logger.info("ChargeBee Event: {} received for Non-existent User: {}", event, AppUser);

            return ResponseEntity.status(HttpStatus.OK).build();

        }

        logger.info("ChargeBee Event: {} received for User: {}", event, AppUser);

        EventType eventType = event.eventType();

        if (eventType.equals(EventType.PAYMENT_SOURCE_ADDED) || eventType.equals(EventType.PAYMENT_SOURCE_UPDATED)) {

            AppUser.setHasPaymentSource(true);

            userManager.managePaymentSourceUpdate(AppUser);

        }

        if (eventType.equals(EventType.PAYMENT_SOURCE_DELETED)) {

            AppUser.setHasPaymentSource(false);

            userManager.managePaymentSourceUpdate(AppUser);

        }

        if (eventType.equals(EventType.PENDING_INVOICE_CREATED)) {

            String invoiceID = event.content().invoice().id();

            userManager.updateInvoiceMetadata(AppUser, invoiceID);

        }

        if (eventType.equals(EventType.PAYMENT_SUCCEEDED)) {

            String invoiceID = event.content().invoice().id();

            int amountInCents = event.content().transaction().amount();

            userManager.applyInvoicePayment(AppUser, invoiceID, amountInCents);

        }

        return ResponseEntity.status(HttpStatus.OK).build();

    }

}

```

When I test it form Chargee I always receive the HTTP 400 error for both v1 and v2.

What is going wrong?

Headers
HTTP/1.1 400 
Server: nginx/1.14.1
Date: Thu, 17 Jan 2019 07:09:57 GMT
Content-Length: 0
Connection: keep-alive
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: 0
X-Frame-Options: DENY

Body
No body returned