Systeme.io

How to integrate Systeme.io with Webflow

Systeme.io handles email marketing, course delivery, and sales funnels while Webflow manages your site design and content. Connecting them lets you capture leads from custom-designed landing pages, trigger automated email sequences based on site activity, and synchronize customer data between platforms without manual exports.

You can embed Systeme.io forms directly in Webflow pages using custom Code Embed elements, connect the platforms through automation tools like Zapier for no-code workflows, or build custom API integrations with middleware for complex bidirectional data synchronization.

Use embedded forms and popups

Systeme.io generates JavaScript embed codes that work in Webflow's Code Embed element or custom code areas. Forms maintain your site's branding while capturing leads directly into Systeme.io lists. Popups trigger based on user behavior like exit intent or scroll depth.

Styling is controlled in Systeme.io's form builder before generating embed codes. Webflow imposes a combined 50,000 character limit across all custom code areas on your site including Site settings, Page settings, Code Embed elements, and CMS fields. If you hit this limit, host scripts externally on a CDN or use services like Slater or GitHub with jsDelivr. Embedded scripts support only client-side HTML, CSS, and JavaScript.

Connect through automation platforms

Zapier and viaSocket provide automation integrations for both Webflow and Systeme.io. Create workflows that sync form submissions, update CMS content, and process e-commerce orders without writing code. Zapier's integration documentation shows how to create Systeme.io contacts from Webflow form submissions, add tags based on which page generated the lead, and synchronize order data. Systeme.io webhooks enable real-time updates when contacts are created or tags are added.

Common automation workflows include:

• Form to contact sync with Webflow form submissions and Systeme.io contact creation creates Systeme.io contacts automatically when visitors submit Webflow forms
• E-commerce customer tagging using Webflow order events and Systeme.io tags segments customers based on purchase behavior for targeted campaigns
• Course access automation through Systeme.io course actions grants course access when Webflow e-commerce orders complete
• CMS synchronization via Webflow collection webhooks and Systeme.io contact updates

Build with Webflow and Systeme.io APIs

The Systeme.io API and Webflow APIs enable custom integrations when embedded forms and automation platforms don't meet your requirements. Webflow doesn't support server-side code, so any custom API integration requires external middleware or serverless functions like AWS Lambda or Cloudflare Workers. This approach provides full control over data flow, error handling, and complex business logic but requires additional infrastructure and development resources.

The Systeme.io API documentation shows authentication uses an X-API-Key header. The Webflow Data API uses Bearer token authentication. Both APIs return JSON responses and include monitoring headers for tracking request status.

Sync form submissions to contacts

Configure Webflow webhooks to send form submission data to your middleware endpoint. The webhook delivers the complete form payload within seconds of submission including all field values, submission ID, and timestamp. Your middleware validates the webhook signature using the x-webflow-signature and x-webflow-timestamp headers. Then it extracts form fields and calls the Systeme.io contacts API endpoint to create or update contacts.

Set up webhooks in Site Settings → Integrations → Webhooks. Select form_submission as the trigger type and provide your HTTPS endpoint URL. Webflow's webhook documentation explains that each webhook includes x-webflow-signature and x-webflow-timestamp headers for validation. The middleware should verify timestamps to prevent replay attacks and validate the signature using HMAC-based verification to ensure webhook authenticity.

For production implementations, create webhooks through the Webflow API rather than the dashboard. API-created webhooks include signature validation headers while dashboard-created webhooks do not.

Create bidirectional CMS synchronization

Use Webflow CMS webhooks for collection_item_created, collection_item_changed, and collection_item_deleted events to push content updates to Systeme.io. Configure Systeme.io webhooks for CONTACT_CREATED, CONTACT_TAG_ADDED, CONTACT_TAG_REMOVED, OPT_IN, NEW_SALE, and SALE_CANCELLED events to update Webflow when customer data changes.

Verify webhook signatures on both sides using HMAC SHA256. Systeme.io includes X-Webhook-Signature headers computed using HMAC SHA256 from the normalized JSON payload and your secret key. Systeme.io's webhook guide shows you configure webhooks through Settings → Webhooks and can trigger them conditionally through funnel automation rules and workflow automations.

Automate course enrollment

Subscribe to Systeme.io webhooks for events like NEW_SALE to receive purchase notifications. Update Webflow CMS with customer data and order status. Use the Webflow CMS API with PATCH /v2/collections/{collectionId}/items/{itemId}/live to update customer records and order information in your Webflow collections.

Handle errors and retries

Both platforms return 429 Too Many Requests when limits are exceeded. Systeme.io includes a Retry-After header indicating seconds until reset. The Systeme.io API reference documents X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Refill headers for proactive monitoring.

Implement exponential backoff with queue systems for high-volume scenarios. Webflow's documentation explains request limits apply across all endpoints for each site token. Monitor response headers to track request capacity and adjust your integration accordingly.

What you can build

Integrating Systeme.io with Webflow lets you combine web design with marketing automation for lead capture, course delivery, and sales funnel management.

• Lead capture landing pages: Build landing pages in Webflow with embedded Systeme.io opt-in forms that automatically add subscribers to email automation sequences based on which page they submit from
• Course sales websites: Create a course marketing site in Webflow that links to Systeme.io checkout pages where Systeme.io handles course delivery, payment processing, and enrollment management
• E-commerce follow-up funnels: Connect Webflow e-commerce orders to Systeme.io automation sequences that send post-purchase emails, request reviews, and promote related products through targeted campaigns