AuthenticationService: publish event .java

// create the event
AccountRegisteredEvent accountRegisteredEvent = new AccountRegisteredEvent(user.getAccountId(), email, firstName, middleName, lastName);
			
// set the message type and publish the AccountRegisteredEvent
this.accountEventSource.accountEvents()
  .send(MessageBuilder.withPayload(accountRegisteredEvent)
  .setHeader("type", "ACCOUNT_REGISTERED_EVENT").build());