Step 1: Link your WhatsApp Business Account
You link a WhatsApp Business Account (WABA) through an embedded sign-up flow that connects Meta's WhatsApp Business Platform to your AWS account. During sign-up you give AWS End User Messaging access to your WABA and allow it to bill you for messages. You can create a new WABA or migrate an existing one. A WABA can exist in only one AWS Region.
Note
You link a WABA through the console, using Meta's embedded sign-up. There is no AWS CLI or API command to link a WABA or add a WhatsApp phone number, because the flow requires you to sign in to Meta and grant access interactively. After the WABA is linked, you manage templates, flows, and messages with the Social messaging API.