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.

[IMAGE: Screenshot of Marketo admin field management navigation]

Step 2: Create custom fields

Create a new custom field for each SourceTag data point:

Core fields (always create)

Field name	Label	Type
`st_fc_channel`	First Contact Channel	String
`st_fc_detail_1`	First Contact Source	String
`st_fc_detail_2`	First Contact Campaign	String
`st_fc_detail_3`	First Contact Term	String
`st_fc_detail_4`	First Contact Content	String
`st_lc_channel`	Last Contact Channel	String
`st_lc_detail_1`	Last Contact Source	String
`st_lc_detail_2`	Last Contact Campaign	String
`st_lc_detail_3`	Last Contact Term	String
`st_lc_detail_4`	Last Contact Content	String
`st_fc_landing_page`	First Contact Landing Page	String
`st_lc_landing_page`	Last Contact Landing Page	String

Optional fields

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

[IMAGE: Screenshot of Marketo custom field creation]

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.

[IMAGE: Screenshot of field mapping in Marketo or integration tool]

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.

[IMAGE: Screenshot of Marketo lead record showing 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.