In each plan configuration page, we have options to configure a redirect URL and also add return variables. 


To configure a custom thank you page URL, navigate to Product catalog > Plans > Create new plan > Hosted pages > Redirect options > Use redirect URL.

 



Here’s a sample URL with mergevars for retrieving the subscription and invoice ids to be displayed in the thank you page: https://acmeinc.com/success.html?sub_id={{subscription.id}}&invoice_id={{invoice.id}}