After creating the External Form and adding all fields in Step 2, the Component Question IDs for each form field must be obtained.
Integration Details

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Add question IDs to form fields

Each field in the form requires a corresponding question ID from Surface Labs to be added to the data-id attribute in the Multi-Step HTML Form: 
<div class="form-group">
  <label for="email">Business email</label>
  <input
    data-id="<Component_Question_ID>"
    type="email"
    id="email"
    name="email"
    placeholder="john@telnyx.com"
    required
  />
</div>
Replace <Component_Question_ID> with the question ID obtained while adding components to the external form in Step 2.