Paid Memberships Pro: how to write a response_url or set up a correct redirect after a successful payment?

Question

PHP

There is a website with online courses, the PaidMembershipsPro plugin, and the Fondy payment system.
How payment works: a person enters data, clicks to pay, then he is redirected to the payment system website, and after successful payment and clicking on the button back to the store website, the person is redirected to the course website, but redirects crookedly, somewhere in the admin panel, despite that the correct redirect url is registered in the payment system. Support responded that the redirect url specified in the plugin takes precedence over the url specified in the payment system settings.
Therefore, in the Paid Memberships Pro plugin, it is necessary to register the so-called response_url - the correct redirect link, but how to do this, because there is no such option in the plugin settings?