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In this step, you’ll configure the Surface Workflow Builder to send a webhook request to Customer.io whenever a lead submits your form—whether they complete it or drop off partway through.

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Open the Workflow Builder

  1. In the Surface app, open your form
  2. Go to the Workflows section
  3. Click Create Workflow (or edit an existing workflow)

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Choose Your Triggers

Surface workflow trigger options
Surface workflows support paths for different triggers, so you can handle both partial and completed submissions in one workflow:
TriggerWhen it firesCustomer.io webhook URL
Form SubmissionWhen the lead completes the entire formURL from your completed webhook campaign
Dropped OffWhen the lead abandons the form mid-wayURL from your partial webhook campaign
Add both triggers to your workflow. Each trigger path sends to a different Customer.io webhook URL (from Step 1), so the right event fires automatically—no need to pass submission_type in the payload.

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Add the HTTP Request Action

HTTP Request configuration
For each trigger path (Dropped Off and Form Submission):
  1. Click the + button to add a new node
  2. Select HTTP Request from the actions menu
  3. In the configuration panel, set:
    • Request URL:
      • Dropped Off path → Paste the webhook URL from your partial Customer.io campaign
      • Form Submission path → Paste the webhook URL from your completed Customer.io campaign
    • HTTP Method: POST
    • Body: Same payload for both paths (see below)

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Build the Webhook Payload

Use the @ symbol in the workflow builder to insert form variables. Your payload should include:
  • Identifier (email) — required for Customer.io to create/update the person
  • Any other fields you want to pass (name, form ID, etc.)
Use the same payload for both paths—the webhook URL determines which event fires in Customer.io. Example payload: 
{
  "email": "@email",
  "first_name": "@first_name",
  "last_name": "@last_name",
  "form_id": "@form_id",
  "submitted_at": "@submitted_at"
}
Replace @email, @first_name, etc. with the actual variable names from your form. Press @ in the workflow builder to see available fields.

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Activate the Workflow

  1. Save the workflow
  2. Activate it so it runs when leads submit your form
  3. Test with a sample submission and verify the webhook reaches Customer.io

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Verify in Customer.io

After a test submission:
  1. Check Customer.io Campaigns → your webhook campaigns → Logs to see if the webhook was received
  2. Check People to confirm the lead was created or updated
  3. Check that the correct event was recorded (partialFormFilled for Dropped Off, formCompleted for Form Submission)

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Next Step

Create the event-triggered email campaigns that will run when these events fire. See Step 3: Event-Based Email Campaigns.