iOS Flutter App "Glassfy" Integration

I'm developing an iOS-based application, where I need to integrate the 'Glassfy' technology, specifically for in-app purchases. The ideal freelancer should be proficient with Glassfy and Flutter and have a good understanding of iOS app development. As I'm yet to define what kind of in-app purchases will be included in the app, the freelancer should have experience with various in-app purchase types, including consumable items, non-consumable items, and auto-renewable subscriptions.