App Rejected for Payments Issue

I’ve implemented RevenueCat on iOS, following the onboarding guide, and my app has been rejected.

struct MainApp: App {

    @AppStorage("isPaying") var isPaying = false

    // inject into SwiftUI life-cycle via adaptor !!!
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    init() {
        Purchases.logLevel = .debug
        Purchases.configure(withAPIKey: "***", appUserID: nil)
    }
...
}

// in PaymentsView
Purchases.shared.purchase(package: package) { (transaction, customerInfo, error, userCancelled) in
                         isLoading = false
                         print(customerInfo)
                         if customerInfo?.entitlements["pro_entitlement"]?.isActive == true {
                             isPaying = true
                         }
                     }