Event hook does not return JSON

Questions
1

I set up an event hook to be triggered when a user is deactivated.

Using the method below, the event hook is successful, but when I print the body object (expecting a JSON payload) , the body is null.

Here is the method signature for the method that the hook is hitting:

@ResponseStatus(HttpStatus.OK)
@PostMapping("/verifyUserDeactivated")
public void verifyUserIsDeactivated(@RequestHeader MultiValueMap<String, String> headers, String body) {
System.out.println(body);