Form Builder can be integrated with MailChimp. After successful integration, the user’s email address first name, last name will be synced with your MailChimp list after submissions which can be used for email marketing.
Follow the steps for guidance –
Step 1. Log in to your Shopify store and navigate to Apps > Form Builder.
Step 2. Create or edit a custom form.
Step 3. Navigate to Form Settings -> Integration -> MailChimp
Step 4. Toggle button to Enable it.
Step 5. Login to your Mailchimp account and copy Mailchimp API Key. Click here to get Mailchimp API Key.
Step 6. Copy the key and paste it to the Mailchimp API Key field.
Step 7. Click on the refresh icon, and select Mailchimp List from the dropdown.
Step 8. Click the Save button.