> For the complete documentation index, see [llms.txt](https://docs-conversational-ai.syntphony.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-conversational-ai.syntphony.com/syntphony-messaging-portal/messaging-tools/technology/embedded-sign-in.md).

# Embedded Sign-In

## Purpose

Connect WhatsApp Business assets to the portal using a guided Meta embedded signup flow.

## Who this is for

Administrators and technical operators onboarding WhatsApp for the first time or adding new business assets.

## Prerequisites

* Meta Business Manager admin access for the owning business.
* Legal business details and support contact information ready.
* Phone number available for WhatsApp API (not active on consumer or Business App); OTP via SMS or voice.
* For a full walkthrough (new number or migration), see [Adding a WhatsApp Phone Number (Embedded Sign-In Guide)](/syntphony-messaging-portal/messaging-tools/technology/whatsapp-add-phone-embedded-signin-guide.md).
* For first-time setup only (no BSP migration), see [First-Time WhatsApp Onboarding (Customer Guide)](/syntphony-messaging-portal/messaging-tools/technology/whatsapp-first-time-embedded-signin-customer-guide.md).

## Steps

1. Open **Technology** and go to **Embedded Sign-In** (or **Sign in with Facebook** / **Embedded Sign-In** as labeled in your tenant).
2. Authenticate with Meta business credentials.
3. Accept requested permissions so the platform can manage WhatsApp assets.
4. Select or create the WhatsApp Business Account (WABA) and phone assets in the flow.
5. Complete phone verification (SMS or voice OTP).
6. Confirm permissions and finish onboarding.
7. Register the number in [Phone Configuration](/syntphony-messaging-portal/messaging-tools/administration/phone-configuration.md) if it does not appear automatically.

## Expected outcome

The selected assets are available for channel configuration in Administration and for outbound Communication.

## Related pages

* [Technology](/syntphony-messaging-portal/messaging-tools/technology.md)
* [Adding a WhatsApp Phone Number (Embedded Sign-In Guide)](/syntphony-messaging-portal/messaging-tools/technology/whatsapp-add-phone-embedded-signin-guide.md)
* [First-Time WhatsApp Onboarding (Customer Guide)](/syntphony-messaging-portal/messaging-tools/technology/whatsapp-first-time-embedded-signin-customer-guide.md)
* [Phone Configuration](/syntphony-messaging-portal/messaging-tools/administration/phone-configuration.md)
* [Source Configuration](/syntphony-messaging-portal/messaging-tools/administration/source-configuration.md)


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