Sync Squarespace Newsletter Signups to Mailchimp via Google Sheets

Description

This workflow captures Squarespace newsletter signups in a Google Sheet and automatically creates new Mailchimp contacts in the selected audience.

It overcomes the limitation in Squarespace’s native Mailchimp integration, which only supports new, empty audiences.

You can trigger the workflow manually or schedule it for continuous synchronization.

Step-by-step tutorial
First, you need to connect Squarespace newsletter block submission to Google Drive
In Mailchimp node, choose your targeted audience in List Name or ID
Connect a Squarespace Form to Google Drive
To connect a form to Google Drive:

In the form's storage options, click Connect on Google Drive.
Log into your Google account.
Click Allow to permit Squarespace to connect to Google Drive.
Enter a Spreadsheet Name. This creates a new spreadsheet for your form submissions.

Columns in my sheet:
Submitted On
Email Address
Name

This structure is inspired by Squarespace’s newsletter block connection, but you can modify it based on your preferred data format.

👉 Clone my Google Sheets template

Requirements

Credentials

To use this workflow, you need:

Mailchimp API Key** – Required to add contacts to Mailchimp.
Google Sheets API credentials** – Required to retrieve signups from the spreadsheet.

📌 Mailchimp API Authentication Guide

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