Sending Leads from Zapier, n8n, Make, or Your CRM

When to use this

Use a Custom Webhook source when the lead starts in a tool that can send HTTP requests but does not have a native LeadToSheet source yet. It is the best current path for Google Lead Form Extensions, TikTok Lead Gen, custom CRMs, Zapier, n8n, Make, and internal systems.

Generate the URL

1. 1

   Open Sources

   In LeadToSheet, open the site that should receive the leads, then choose Sources.

2. 2

   Pick Custom Webhook

   Click the Custom Webhook card and generate a signed URL for the site.

3. 3

   Name it

   Use a name you will recognise later, such as Google Lead Forms via Zapier or Website CRM export.

4. 4

   Copy the URL and signing secret

   The signing secret is shown once. Store it in your automation tool or secret manager before closing the dialog.

Send a signed POST

Each request must include an HMAC-SHA256 signature of the raw request body in the x-leadtosheet-signature header, with the sha256= prefix, computed using your signing secret.

Payload shape

LeadToSheet accepts three common JSON shapes. Pick the one that matches your sender.

• Wrapped: { "fields": { "Email": "alice@example.com", "Full name": "Alice" }, "submittedAt": "2026-05-09T10:00:00Z" }
• Wrapped automation style: { "data": { "Email": "alice@example.com" } }
• Flat: { "Email": "alice@example.com", "Full name": "Alice" }

Zapier walkthrough

1. 1

   Create a Zap

   Choose your source app as the trigger, such as Google Lead Form Extensions, TikTok Lead Gen, or your CRM. Use Webhooks by Zapier -> Custom Request as the action.

2. 2

   Method and URL

   Set Method to POST, paste the LeadToSheet webhook URL, and send Content-Type: application/json.

3. 3

   Compute the HMAC

   Add a Code by Zapier step that computes a SHA-256 HMAC of the exact JSON body using your signing secret, then prefixes the digest with sha256=.

4. 4

   Map the fields

   Build the JSON body with the field names you want to see in LeadToSheet. Those names carry through to the form, lead table, sheet, and routes.

Verify your setup

Before wiring the full automation, run a connectivity check: GET the webhook URL with ?ping=hello and an x-leadtosheet-signature header containing sha256= followed by an HMAC-SHA256 of the ping value using your signing secret. LeadToSheet echoes hello if the signature matches.