Embedded Signup
Updated
Quick answer: Embedded Signup is Meta's onboarding flow that lets you connect a phone number to the WhatsApp Business API from inside a provider's app. You log in with Facebook, choose or create your Meta Business portfolio and WhatsApp Business Account, add and verify your number, and set your display name — usually in a few minutes and without any code.
Meta's in-app flow for connecting a number to the WhatsApp Business API.
Advertz uses Embedded Signup on the Link Meta WhatsApp screen, so your WhatsApp Business Account stays in your own Meta Business portfolio.