Campaign Monitor

How to integrate Campaign Monitor with Webflow

Campaign Monitor helps you build email marketing campaigns, manage subscriber lists, and track engagement metrics. Connecting it with Webflow lets you capture leads from your site and sync subscriber data automatically.

You can integrate Campaign Monitor with Webflow using embed forms, third-party automation platforms, and direct API integration. You can build with the Campaign Monitor API v3.3 and Webflow REST API v2 for custom workflows requiring programmatic control over subscriber management, campaign creation, and analytics tracking.

Embed Campaign Monitor forms

Campaign Monitor provides three embed options through a visual form builder. Create forms in Campaign Monitor's dashboard, customize fields and styling through GUI controls, then paste the generated code into Webflow's Code Embed element. This works for straightforward lead capture where you control form design in Campaign Monitor rather than Webflow.

You can choose from several types of forms:

• Subscribe buttons that open subscription forms
• Embedded forms with field-level styling controls
• Pop-up forms with timed or exit-intent triggers
• Landing pages created using Campaign Monitor's visual builder

Design forms using Campaign Monitor's GUI-based form builder, customize styling and fields through visual controls, then copy the generated embed code. In Webflow, add a Code Embed element to your page and paste the code snippet. The form posts directly to Campaign Monitor's servers, bypassing Webflow's form handling.

This approach uses Campaign Monitor's styling rather than your Webflow design system. Customization happens in Campaign Monitor's form builder, not in Webflow. This creates visual inconsistency unless you customize the embed code CSS to match your site.

Connect through automation platforms

Zapier and Make.com connect native Webflow forms to Campaign Monitor lists without code. Design forms in Webflow while routing submissions to Campaign Monitor through visual automation workflows.

Zapier's Campaign Monitor and Webflow integration connects through these steps:

1. Create a Zap with Webflow as the trigger app
2. Select "New Form Submission" as the trigger event
3. Connect your Webflow site using your API key from Account Settings > Integrations
4. Choose Campaign Monitor as the action app
5. Select "Add Subscriber to List" or "Update Subscriber"
6. Map Webflow form fields to Campaign Monitor subscriber fields
7. Test the automation and activate

Make.com offers similar functionality with conditional logic capabilities. Both platforms provide free tiers for testing. Production volume may require paid plans.

This method uses native Webflow forms designed in Webflow, maintaining complete visual control. Form submissions flow through the automation platform's servers to Campaign Monitor. Each form submission consumes one automation task from your Zapier or Make.com quota. High-volume forms may exceed free tier limits quickly.

Build with Webflow and Campaign Monitor APIs

Direct API integration provides complete control over data flow. Build custom subscriber management dashboards, automate campaign creation from Webflow CMS collections, implement conditional segmentation logic based on user behavior, and create bidirectional synchronization between platforms.

The Campaign Monitor API v3.3 and Webflow REST API v2 both use REST architecture with JSON payloads. This method requires server-side code and attention to technical constraints including Campaign Monitor's rate limit of 60 requests per minute for transactional endpoints, OAuth token expiry after 14 days of inactivity, 20-webhook-per-list limit, and Webflow's rate limits of 60 requests per minute per site.

Production deployments need request queuing, token refresh logic, and webhook handlers that produce consistent results when processing duplicate data.

Campaign Monitor supports two authentication methods. Use Basic Authentication with API keys formatted as Basic Base64(APIKey:'') or OAuth 2.0 with Bearer tokens for third-party integrations.

The Webflow REST API Introduction requires OAuth 2.0 authentication with Bearer tokens in the Authorization: Bearer <token> header format and granular scope-based permissions including sites:read, cms:read, cms:write, forms:read, and forms:delete.

Never implement client-side integration that exposes API keys in browser JavaScript. Use server-side proxy endpoints that authenticate with both APIs securely while keeping credentials hidden from browser inspection tools. Client-side integration creates security vulnerabilities allowing unauthorized access to subscriber data.

Sync form submissions to subscriber lists

Add form submitters to Campaign Monitor lists automatically. This workflow captures email addresses and custom field data from Webflow forms, then creates or updates Campaign Monitor subscribers through API calls. Poll for new submissions on a schedule, filter by date ranges, and batch-process multiple submissions.

You can:

• Retrieve form submissions with Webflow Forms API to extract submission data including fields, timestamps, and metadata
• Add individual subscribers with Campaign Monitor Subscribers API to create subscriber records with email and custom fields
• Batch import subscribers with Campaign Monitor Import API to process up to 5,000 subscribers per API call

Poll Webflow's Forms API on a scheduled interval while respecting the rate limits of 60 requests per minute per site and 600 requests per hour per account. Filter for new submissions since the last sync, then batch-add subscribers to Campaign Monitor using the batch import endpoint with a maximum of 5,000 subscribers per API call. Store the latest submission timestamp to avoid duplicate processing.

Bulk import subscribers from Campaign Monitor

Migrate existing customer databases or process accumulated form submissions in large batches. Campaign Monitor's bulk import API handles up to 5,000 subscribers per call. Export customer data from Webflow CMS collections and import directly to Campaign Monitor lists with custom field mapping.

Campaign Monitor custom field names must match the regex pattern ^[A-Za-z0-9_]{1,50}$. Transform Webflow field names containing spaces or hyphens before sending to Campaign Monitor. Field data types cannot be changed after creation.

Create campaigns from Webflow content

Generate and send email campaigns when publishing new blog posts or content updates. This workflow pulls content from Webflow CMS collections, creates draft campaigns in Campaign Monitor, and schedules delivery to subscriber lists. This requires custom backend code or automation platform setup to handle content formatting and campaign creation.

Campaign Monitor's OAuth access tokens expire after 14 days. Implement token refresh logic before expiry using the refresh token to avoid workflow interruptions. Refresh tokens expire after 14 days of inactivity, requiring complete re-authentication if not refreshed within that window.

Track campaign analytics

Build custom reporting dashboards or trigger follow-up actions based on email performance. Campaign Monitor's analytics endpoints provide detailed metrics on opens, clicks, bounces, and recipient behavior. Store this data in Webflow CMS to create visual reports or conditional workflows based on engagement thresholds..

All analytics endpoints return paginated results with a maximum of 100 items per page. Implement loop logic that fetches all pages by incrementing the page parameter until receiving an empty results array.

What you can build

Connect Campaign Monitor with Webflow to build automated email marketing systems that respond to site activity and maintain synchronized subscriber data.

• Lead capture with profile building: Build multi-page resource libraries where downloading each asset triggers a targeted email series. Connect Webflow forms to Campaign Monitor through Zapier or Make.com for progressive profiling that updates subscriber records as visitors engage with more content
• Event registration workflows: Create event landing pages in Webflow that capture registrations through native forms and automatically add registrants to Campaign Monitor lists using Zapier or Make.com automation, triggering confirmation emails, reminder sequences, and post-event follow-up campaigns.
• Customer segmentation by purchase behavior: Design product catalogs in Webflow that sync purchase data to Campaign Monitor custom fields through Zapier or Make.com for automated segments enabling post-purchase sequences, replenishment reminders, and product recommendation campaigns.
• Content-triggered newsletters: Build blog sections where publishing new posts generates Campaign Monitor campaigns by connecting Webflow CMS collections through automation platforms or custom API code. This requires backend development or manual Campaign Monitor setup for content formatting and campaign creation rather than full automation through platforms alone