Apps are not allowed to link the website for purchasing. That's one of Apple's rules. https://developer.apple.com/app-store/review/guidelines/#in-app-purchase

Apps are not allowed to link the website for purchasing. That's one of Apple's rules. https://developer.apple.com/app-store/review/guidelines/#in-app-purchase https://developer.apple.com/app-store/review/guidelines/#in-... > Apps and their metadata may not include buttons, external links, or other calls to action that direct customers to purchasing mechanisms other than in-app purchase.