How to set a successful URL for In-App Purchases? If I use your in-app purchase API, would it be possible to identify the buyer grant full access to web content? If yes, do I need to do it manually or is it an integrated solution?

Please check out https://www.webviewgold.com/docs/iOS/#inapppurchases (iOS) or https://www.webviewgold.com/docs/android/#inapppurchases (Android). Our In-App Purchase API allows you to redirect to an URL in a successful payment/subscription case. If the subscription expired, another expiration URL will be called. Both URLs can be used to trigger upgrading your user in the database or setting a client-side “premium” cookie.