Before Embedded Signup, getting on the WhatsApp Business API meant a manual back-and-forth with a provider that could take days. The flow compresses that into a few screens: log in with Facebook, pick or create a business portfolio, register a phone number, and grant the platform access.
Technically, it is an OAuth-style authorization: the business keeps ownership of its WhatsApp Business Account while the platform is granted permission to manage messaging, templates, and webhooks on its behalf.
This is the flow behind the connect-WhatsApp button in most modern WhatsApp marketing tools. It creates the WABA, verifies the number with a code, and leaves the merchant ready to send without ever opening Meta's developer console.
