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

Description

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

Get credentials: Retrieve your App ID and App Secret from Meta for Developers.
Generate a short-lived token: Use Graph API Explorer with pages_manage_metadata and pages_show_list permissions.
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).
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:
Smart human takeover & auto pause AI-powered Facebook Messenger chatbot
Build a Facebook Messenger customer service AI chatbot with Google Gemini
Smart message batching AI-powered Facebook Messenger chatbot use Data Table

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