Setup Shopping Cart Referred By Widget
GoAffPro provides you with the option to set up the Shopping Cart Referred By widget. When enabled, it will let customers enter an affiliate's referral code on the shopping cart page.
To set up the shopping cart referred by widget, go to the Toolbars section in the Look and Feel tab of the GoAffPro admin panel.

Look and Feel > Toolbars
Here, enable the toggle in the Shopping Cart Referred By section.
You also have the option to customize the Shopping Cart Referred By widget by clicking on Customize.

Enable the toggle
Finally, the Shopping Cart Referred By widget will appear on the shopping cart page of the store.

Setup Shopping Cart Referred By Widget