I have been searching the forums trying to find an example/answer but have yet to find it. We are developing our app(s) and we need a page that follows the billing confirmation i.e one page that says "Thank you" and leads the merchant to the app and one page that leads the merchant (where?) if their billing has been declined or they declined payment. I hope this question is clear - if anyone has any examples it will help.
https://help.shopify.com/en/api/app-store/listing-in-the-app-store/app-requirements-and-success-criteria/app-success-criteria - basically what follows "mercant onboarding"