Every request to the WhatsApp API needs to be authorized using API Key authentication. Adding the MB-API-KEY in the header with your unique API Key as a value is enough to gain permission.
Every API Key is connected to one phone number. We authenticate and choose the right WhatsApp Business Account and Number based on your MB-API-KEY.
Our WhatsApp portal will be available soon. On this portal, you will be able to deploy a new number using Facebook's new embedded signup process and then generate an MB-API-KEY for your phone number to be able to authorize your calls to our WhatsApp API endpoints.