How to use hidden fields in a landing page to track subscription source
You can use hidden fields to track your landing page's performance and subscription source. These fields will be automatically assigned to all contacts who sign up to your list using your landing page. Follow these steps to set it up:
1. Create a new custom field
2. Add this field to your landing page
3. Mark it as "hidden" and assign it a custom value
4. Update your landing page. All new contacts coming from that landing page will have this value assigned to them automatically.