SourceTag

Form Setup

Set up SourceTag with Formidable Forms

Formidable Forms has a visual form builder with a dedicated Hidden field type. You add one field per SourceTag data point, then set the field key to match.

What you need

  • SourceTag installed on your site (script tag or WordPress plugin)
  • Formidable Forms (free or Pro)

Step 1: Open your form in the Formidable editor

Go to Formidable > Forms and click on the form you want to track.

[IMAGE: Screenshot of Formidable Forms form list with edit button highlighted]

Step 2: Add hidden fields

  1. In the form editor, look at the field panel on the right
  2. Scroll down to the Misc section (sometimes called “Advanced Fields” depending on your version)
  3. Click Hidden to add a hidden field to your form
  4. Repeat for each SourceTag field you need

[IMAGE: Screenshot of Formidable Forms field panel showing the Misc section with Hidden field type]

Core fields (add these)

Add a hidden field for each of the following:

  • st_fc_channel
  • st_fc_detail_1
  • st_fc_detail_2
  • st_fc_detail_3
  • st_fc_detail_4
  • st_lc_channel
  • st_lc_detail_1
  • st_lc_detail_2
  • st_lc_detail_3
  • st_lc_detail_4
  • st_fc_landing_page
  • st_lc_landing_page

Optional extended fields

If you have enabled extended field groups in your SourceTag dashboard, also add:

  • st_fc_click_id and st_lc_click_id (click IDs)
  • st_visits (visit count)
  • st_days_to_convert (days since first visit)
  • st_device (device type)

[IMAGE: Screenshot of Formidable Forms editor showing multiple hidden fields added]

Step 3: Set the field key

This is the important bit. For each hidden field:

  1. Click on the hidden field in the form editor
  2. In the field settings panel, find the Field Key setting
  3. Set it to the SourceTag field name exactly (e.g. st_fc_channel)
  4. Leave the Default Value empty

The field key is what SourceTag uses to locate and populate the field. It must match the SourceTag field name precisely, including case and underscores.

[IMAGE: Screenshot of Formidable Forms field settings panel showing the Field Key input]

Step 4: Save and test

Click Update to save your form. Visit a page with this form using UTM parameters:

?utm_source=test&utm_medium=cpc&utm_campaign=formidable-test

Submit the form. Go to Formidable > Entries and open the test submission. The hidden fields should contain your attribution data.

[IMAGE: Screenshot of Formidable Forms entry showing populated hidden fields with attribution data]

Tips

  • You can copy field names from the Fields page in your SourceTag dashboard (each name has a copy button).
  • Hidden fields are not visible to visitors. They only appear in entries and email notifications.
  • If you are sending form data to a CRM or email marketing platform, make sure you map the hidden fields in your integration settings.
  • Formidable’s Visual Views and reports can display hidden field data, which is handy for building attribution reports inside WordPress.