messages: Used to notify you when you get a new message and what is in the new message.
statuses: Used to notify you when there's a status change in a message you sent.
errors: When there are any out-of-band errors that occur in the normal operation of the application, this array provides a description of the error.
HTTPS 200 OKresponse to notifications. Otherwise the WhatsApp Business API client considers that notification as failed and tries again after a delay.
PASSshould be provided in the header