Constant Contact

How to integrate Constant Contact with Webflow

Automate lead capture by connecting Webflow forms directly to Constant Contact email lists. Form submissions flow into your subscriber lists without manual data entry, keeping your email marketing database current as visitors sign up on your site.

Connect the two platforms through IFTTT for no-code automation of form submissions to email lists, or build custom integrations using the Constant Contact V3 API and Webflow Data API for advanced control over contact syncing, CMS updates, and list management.

Use IFTTT

IFTTT automates Webflow form submissions to Constant Contact without code. When someone submits a Webflow form, IFTTT captures the submission and adds the contact to your Constant Contact lists automatically.

Set up an IFTTT account and connect both your Webflow site and Constant Contact account. And install the IFTTT official Webflow app from your project dashboard.

Create an automation (called an "Applet") that triggers when a new Webflow form submission occurs, then adds that contact to a specified Constant Contact list.

IFTTT works well for straightforward form-to-list automation. The platform handles authentication, data transfer, and error handling through a visual interface. This approach lets you automate lead capture in minutes rather than building custom integration code.

IFTTT supports basic field mapping between Webflow form fields and Constant Contact contact properties. You can route form submissions to different lists based on form type, but complex conditional logic or CMS synchronization requires custom API integration instead.

Build with Webflow and Constant Contact APIs

Build custom integrations that sync form submissions and CMS data to Constant Contact lists. Use Webflow's form submission and CMS APIs to retrieve data, then call Constant Contact's contact management endpoints to create or update subscribers.

Here are some capabilities that the Webflow Data API enables:

• Provides access to form submissions through GET /sites/{site_id}/form_submissions
• Get individual submissions with GET /form_submissions/{form_submission_id}
• List all submissions for a specific form using GET /forms/{form_id}/submissions

The Constant Contact contacts API uses POST /contacts/sign_up_form for both new contacts and updates to existing ones.

Set up OAuth2 authentication for both platforms following Constant Contact's auth guide and Webflow's authentication documentation. Use site tokens for single-site implementations or OAuth flows for multi-site applications.

This integration enables the following actions:

• Retrieve form submissions with GET /sites/{site_id}/form_submissions to access email addresses, names, and custom field data
• Create or update contacts using POST /contacts/sign_up_form for operations that handle both new contacts and updates without creating duplicates
• Manage contact lists through GET /contact_lists to retrieve list IDs and POST /activities/add_list_memberships for bulk assignments
• Update existing contacts via PUT /contacts/{contact_id} when contact data changes in Webflow CMS
• Filter and search contacts using GET /contacts with query parameters for email, list membership, tags, and date ranges

Authentication requires Bearer tokens in request headers as Authorization: Bearer <token>. Handle API responses and implement error handling for network issues or rate limits.

Sync Webflow form submissions to Constant Contact lists

Connect form submissions directly to email lists. When someone fills out a Webflow Form, your integration captures the submission, transforms the data to match Constant Contact's schema, then adds the contact to designated lists.

Use Webflow's form submission webhook to receive instant notifications when forms are submitted. Configure webhooks through the Webflow API to trigger your integration code immediately. Extract email addresses and any additional fields like name, phone number, or custom properties from the submission data.

If webhook setup isn't feasible, poll GET /sites/{site_id}/form_submissions on a schedule.

Send contact creation requests to Constant Contact's sign-up form endpoint. Include list_memberships in the request body to assign contacts to specific lists based on which Webflow form they submitted.

For high-volume forms, use bulk import operations with POST /activities/contacts_json_import to process multiple contacts in one request. The endpoint returns an activity_id for status monitoring through GET /activities/{activity_id}.

Store the last processed submission timestamp to avoid duplicate processing. Log failed submissions for retry attempts since network issues can interrupt the sync process.

Update Constant Contact contacts from Webflow CMS changes

Sync contact data when you update CMS collection items containing subscriber information. Use this pattern for member directories, customer databases, or any CMS structure where contact details need to stay synchronized with email lists.

Use Webflow's CMS API to monitor collection items with GET /collections/{collection_id}/items. When email addresses, names, or custom fields change, call Constant Contact's update contact endpoint with PUT /contacts/{contact_id}.

First retrieve the contact from Constant Contact using GET /contacts with email filter parameters to get the contact_id. Then send the update request.

Webflow webhooks can notify your integration when collection_item_changed events occur, reducing the need for polling. Note that Webflow CMS webhooks must be created through the API and cannot be configured through site settings. If webhook setup via API isn't feasible, implement scheduled polling of the CMS API instead.

Constant Contact's V3 API uses PUT requests for updates, which require sending the complete contact object including all existing fields. Sending only changed fields will overwrite other data with null values. Always fetch the full contact first using GET /contacts, modify the necessary fields, then send the complete object via PUT.

Constant Contact does not provide webhooks for contact data changes. Their webhook system is limited to partner billing events like account status and subscription changes. For two-way synchronization of contact updates from Constant Contact back to Webflow, implement scheduled polling of the GET /contacts endpoint with updated_at filters.

Manage list subscriptions based on Webflow interactions

Assign contacts to different lists based on form selections or CMS data properties. Create segmented lists that reflect subscriber preferences tracked in Webflow.

When processing form submissions, check for fields that indicate which lists the contact should join. Map these values to Constant Contact list IDs retrieved from GET /contact_lists.

Use bulk list membership operations with POST /activities/add_list_memberships to add multiple contacts to a list simultaneously. The endpoint accepts arrays of contact IDs and list IDs, processing assignments in the background.

Remove contacts from lists with POST /activities/remove_list_memberships when they update preferences or unsubscribe from specific content types.

List membership changes happen asynchronously in Constant Contact. Poll the activity status endpoint to confirm completion before showing success messages to users. Store list ID mappings in your integration configuration since list IDs are unique identifiers that don't change.

What you can build

Integrating Constant Contact with Webflow lets you build automated email marketing systems that respond to site activity and maintain synchronized contact data.

• Newsletter signup forms: Add subscribers directly to specific Constant Contact email lists with automatic welcome email triggers based on list assignment
• Content upgrade delivery systems: Add visitors to nurture sequences in Constant Contact when they download resources while storing download permissions in Webflow CMS
• Event registration with email follow-up: Create contacts in segmented lists based on event type, location, or ticket tier for targeted campaign delivery
• Member directory sync: Maintain a Webflow CMS collection of members or customers that updates corresponding Constant Contact contact records when profile information changes