Register event attendance via webhook with Google Sheets and Gmail
Ready for 3.0Ready for 3.0. This template uses no nodes that n8n 3.0 removes. No removed nodes, versions or helpers found. Static check, last run 2026-10-19.
What this workflow does
This workflow has 11 nodes and runs when an HTTP POST request hits its webhook URL. Along the way it connects Google Sheets and Gmail.
How it runs
Trigger: When an HTTP POST request hits its webhook URL.
- Check Input Validity (Code): runs custom JavaScript code
- Check Validity Status (If): checks a condition and branches into true / false
- Retrieve Sheet Data (Google Sheets): uses Google Sheets
- Return Error Response (Respond to Webhook): sends the response back to the webhook caller
- Identify Duplicates (Code): runs custom JavaScript code
- If: checks a condition and branches into true / false
- Return Duplicate Response (Respond to Webhook): sends the response back to the webhook caller
- Add New Entry to Sheets (Google Sheets): append
- Dispatch Confirmation Email (Gmail): uses Gmail
- Return Success Response (Respond to Webhook): sends the response back to the webhook caller
Services it uses
Before you upgrade to n8n 3.0
Nothing in this workflow is removed in n8n 3.0, so it should import and run after the upgrade.
Nodes used (6)
- Code
n8n-nodes-base.code - If
n8n-nodes-base.if - Google Sheets
n8n-nodes-base.googleSheets - Gmail
n8n-nodes-base.gmail - Respond to Webhook
n8n-nodes-base.respondToWebhook - Webhook
n8n-nodes-base.webhook
From the author
Quick overview This workflow powers a QR code-based event attendance system. A presenter displays a QR code (generated via the companion web app) which participants scan with their phones. Scanning opens a registration form pre-filled with the Event ID; on…