iOS xcode swift developer to implement in app payment / subscription into existing 95% complete app


I have an app that is 95% complete, currently on test flight and functional. But it requires in-app payment for a free, monthly, and yearly subscription model. Current developer is great at the backend implementations, but inexperienced with in-app payment integration. App is an iOS safari browser plugin with MongoDB and digital ocean. It's a relatively small and straightforward app (it's not a complex game) Please detail your experience in x-code with integrating in-app payments, and the processes to successfully implement for a free version (limited features), monthly (access to all features), and yearly (access to all features).

Keyword: iOS Development

iOS iOS Development Mobile App Development Swift In-App Purchases Apple Xcode

 

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