Automate LINE & Google account linking with OAuth2 authentication

by s3110 ✓ · 139 views · created 2025-11-18 · Miscellaneous

What this workflow does

This workflow has 9 nodes and runs when an HTTP POST request hits its webhook URL (plus 1 other trigger). It uses only n8n's built-in nodes. It also calls oauth2.googleapis.com, googleapis.com and api.line.me over HTTP.

How it runs

Trigger: When an HTTP POST request hits its webhook URL (plus 1 other trigger).

1. If: checks a condition and branches into true / false
2. Get Google Access Token (HTTP Request): calls oauth2.googleapis.com (POST)
3. Create Google Auth URL (Edit Fields (Set)): sets 1 field: googleAuthUrl
4. Get Google User Info (HTTP Request): calls googleapis.com
5. Send Auth Link to LINE (HTTP Request): calls api.line.me (POST)
6. Send Completion Message to LINE (HTTP Request): calls api.line.me (POST)
7. Redirect to LINE OA (Respond to Webhook): sends the response back to the webhook caller

HTTP calls to: oauth2.googleapis.com, googleapis.com, api.line.me

Before you upgrade to n8n 3.0

Nodes used (5)

• Respond to Webhookn8n-nodes-base.respondToWebhook
• HTTP Requestn8n-nodes-base.httpRequest
• Ifn8n-nodes-base.if
• Edit Fields (Set)n8n-nodes-base.set
• Webhookn8n-nodes-base.webhook

From the author

LINE x Google Account Linking Workflow This workflow automates the process of linking a new user on your LINE Official Account to their Google Account. When a user adds your LINE account as a friend, this workflow automatically sends them a message with a…

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