Set up SourceTag with Marketo

When a visitor submits a form with SourceTag data, the attribution fields need somewhere to go in Marketo. You need to create custom lead fields that match the SourceTag field names.

What you need

• SourceTag installed and form hidden fields set up
• Marketo account with admin access

Step 1: Go to custom fields settings

In Marketo, navigate to Admin > Field Management to create new custom fields on the Lead object.

Step 2: Create custom fields

Create a new custom field for each SourceTag data point:

Core fields (create these)

Field name	Label	Type
st_fc_channel	First Click Channel	String
st_fc_detail_1	First Click Smart Field 1	String
st_fc_detail_2	First Click Smart Field 2	String
st_fc_detail_3	First Click Smart Field 3	String
st_fc_detail_4	First Click Smart Field 4	String
st_lc_channel	Last Click Channel	String
st_lc_detail_1	Last Click Smart Field 1	String
st_lc_detail_2	Last Click Smart Field 2	String
st_lc_detail_3	Last Click Smart Field 3	String
st_lc_detail_4	Last Click Smart Field 4	String
st_fc_landing_page	First Click Landing Page	String
st_lc_landing_page	Last Click Landing Page	String

Optional extended fields

Field name	Label	Type
st_fc_click_id	First Click Click ID	String
st_lc_click_id	Last Click Click ID	String
st_visits	Visit Count	Integer
st_days_to_convert	Days to Convert	Integer
st_device	Device Type	String

See Captured Fields for the full list of available fields.

Step 3: Map form fields to Marketo fields

If your form builder sends data to Marketo via an integration (Zapier, webhook, etc.), make sure the SourceTag form fields are mapped to the corresponding Marketo custom lead fields. If you are using Marketo forms directly, add the SourceTag fields as hidden fields on the Marketo form and map them to the custom fields you created.

Step 4: Test

Submit a form with UTM parameters and check the lead record in Marketo. The custom fields should be populated with attribution data.

Tips

• Marketo field API names are auto-generated and may differ from the display name. Use the API name when mapping fields in integrations.
• If you sync Marketo with a CRM (Salesforce, Dynamics), consider creating matching fields in the CRM and setting up field sync so attribution data flows through.
• Test with a fresh lead (not one that already exists) for the cleanest test.