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    Whatsapp Embedded Signup

    by Jose Vallejo

    Complete implementation guide for Meta WhatsApp Embedded Signup with FastAPI and Next.js.

    Updated Jun 2026
    Security scanned

    $30

    · or 150 credits

    30-day refund guarantee

    Secure checkout via Stripe

    Included in download

    • Onboard client WhatsApp accounts without Meta Business Manager access.
    • Verify and handle mandatory Meta compliance data deletion webhooks.
    • terminal, network, env_vars automation included
    • Instant install

    See it in action

    You say

    Set up the backend handler to exchange the Meta OAuth code for a permanent system user token and subscribe the WABA to our webhook.

    Your agent does

    The goal is to implement exchange_code_for_token and subscribe_waba_to_webhooks.

    1. Exchange code for access_token using your META_APP_SECRET.
    2. Save the waba_id and phone_number_id (indexed).
    3. Call the subscribed_apps endpoint using the new client-specific token.

    Avoid await db.commit() inside tenant sessions; use flush() to prevent resetting the search path.

    About This Skill

    The problem

    Integrating Meta's WhatsApp Embedded Signup is notoriously error-prone, involving complex JavaScript SDK handshakes, server-side OAuth exchanges, and specific Meta Business Manager configurations that often fail silently or return cryptic errors.

    What it does

    • Provides a complete implementation pattern for both Coexistence mode and standard Cloud API flows.
    • Enables server-side HMAC-SHA256 verification for mandatory Meta compliance webhooks.
    • Implements a generic webhook routing system to handle multi-tenant message delivery via phone_number_id.
    • Configures the Next.js frontend to capture the specific window.postMessage events required for reliable onboarding.
    • Solves specific PostgreSQL search_path bugs and multi-tenant session management issues during the connection lifecycle.

    Frameworks & tools

    FastAPI, Python, Next.js, React, Meta Graph API, PostgreSQL.

    Why this beats prompting it yourself

    Generic LLM prompts often miss the critical featureType parameters and Meta-specific event strings like FINISH_WHATSAPP_BUSINESS_APP_ONBOARDING that are poorly documented. This skill provides the battle-tested configuration values and backend routing logic needed to avoid the "JSSDK is disabled" and "code already used" errors that stall development.

    Use cases

    • Onboarding client WhatsApp Business Accounts directly from your SaaS dashboard.
    • Enabling "Coexistence" so clients can use your platform and their mobile app simultaneously.
    • Setting up required "Deauthorize" and "Data Deletion" endpoints for Meta App Review.
    • Migrating clients from other BSPs (Twilio, MessageBird) to your own Tech Provider app.

    Known limitations

    Requires an approved Meta Tech Provider status and an app in production mode. Coexistence mode availability depends on the quality and history of the client's phone number.

    Use Cases

    • Onboard client WhatsApp accounts without Meta Business Manager access.
    • Enable dual-app usage with WhatsApp Cloud API Coexistence mode.
    • Verify and handle mandatory Meta compliance data deletion webhooks.
    • Route multi-tenant WhatsApp messages using a generic webhook endpoint.

    Reviews

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    Security Scanned

    Passed automated security review

    Permissions

    Terminal / Shell
    Network Access
    Environment Variables

    File Scopes

    whatsapp-embedded-signup/**

    Tags

    whatsapp
    meta
    embedded-signup
    coexistence
    cloud-api
    webhook
    oauth
    waba

    Creator

    J

    Frequently Asked Questions

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