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Get long-lived Facebook Page access tokens and subscribe Messenger webhook fields via Graph API

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Get long-lived Facebook Page access tokens and subscribe Messenger webhook fields via Graph API preview
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Overview

Get Long-Lived Facebook Page Access Token and Subscribe Messenger Webhook Fields

This n8n template automates two critical one-time setup steps required before any Facebook automation can go live: it exchanges a short-lived User Access Token for a long-lived one (~60 days), retrieves Page Access Tokens for all connected Facebook Pages, and subscribes each Page to the webhook fields your app needs — all in a single manual run.

If you're building a Messenger chatbot or automating comment replies on Facebook Pages, run this utility workflow once as part of your initial setup.

How it works

  • Needed Value node: Set your app_id, app_secret, short-lived short_user_access_token, and field_to_add (the webhook subscription fields) in one place — no other node needs editing.
  • Token Exchange: Calls the Facebook Graph API to exchange the short-lived token for a long-lived User Access Token, then resolves the app-scoped User ID.
  • Page Token Retrieval: Fetches long-lived Page Access Tokens for all Pages connected to this user.
  • Per-Page Webhook Subscription: Loops through each Page — fetches its existing subscribed fields, merges them with your new fields, and POSTs the combined list back to the Graph API.
  • Rate Limiting: A 1-second Wait node between each Page prevents hitting Facebook's API rate limits.

How to use

  1. Get credentials: Retrieve your App ID and App Secret from Meta for Developers.
  2. Generate a short-lived token: Use Graph API Explorer with pages_manage_metadata and pages_show_list permissions.
  3. Fill in Needed Value: Enter all four config fields. Set field_to_add based on your use case (e.g., messages,messaging_postbacks for Messenger chatbots, or add feed for comment automation).
  4. Run manually: Click "Execute Workflow". The output of Get long-lived page access token contains the Page Access Token — copy it into your chatbot workflows.

Requirements

  • n8n Version: Built and tested on n8n 2.9.4+. (It is highly recommended to update to the latest n8n version.)
  • A Facebook App with Messenger product enabled and pages_manage_metadata permission approved.
  • No external credentials needed inside n8n — all API calls use the token from the Needed Value node.

Customizing this workflow

  • Different webhook fields: Update field_to_add — common values: messages, messaging_postbacks, messaging_optins, message_deliveries, feed.
  • Auto-refresh tokens: Swap the Manual Trigger for a Schedule Trigger every 50 days so your long-lived tokens never expire unexpectedly.
  • Notify on completion: Add a Telegram or Gmail node after the loop to confirm successful subscription for each Page.

Related workflows by the same author:

About the Author

Created by: Nguyễn Thiệu Toàn (Jay Nguyen) - n8n Verified Creator Email: [email protected] Website: nguyenthieutoan.com Company: GenStaff (CEO/Founder) (genstaff.net) Socials (Facebook / X / LinkedIn): @nguyenthieutoan More templates: n8n.io/creators/nguyenthieutoan