You are viewing beta documentation for Formie 4.x.
Email Marketing
Customer.io
Follow the below steps to connect to the Customer.io API.
Step 1. Create the Integration
- Navigate to Formie → Settings → Email Marketing.
- Click the New Integration button.
- Select Customer.io as the Integration Provider.
Step 2. Connect to the Customer.io API
- Go to Customer.io and login to your account.
- In the left-hand sidebar menu, click on Date & Integrations.
- Click on the Custom.io API button.
- Copy the Site ID from Customer.io and paste in the Site ID field in Formie.
- Copy the API Key from Customer.io and paste in the API Key field in Formie.
Step 3. Test Connection
- Save this integration.
- Click on the Refresh button in the right-hand sidebar.
Step 4. Form Setting
- Go to the form you want to enable this integration on.
- Click the Integrations tab.
- In the left-hand sidebar, select the name you gave the integration.
- Enable the integration and fill out all required fields.
- Click Save to save the form.
Last updated: June 2, 2026, 3:49:35 PM