SKPaymentTransactionObserver class defines an object that is responsible for handling transactions that are removed or updated within the queue.
SKProductsRequestDelegate interface is the delegate that is responsible for handling operations related to SKProductsRequest objects.
SKRequestDelegate interface is the delegate responsible to collaborate with SKRequest objects.
SKError class defines different types of errors related to StroreKit.
SKMutablePayment class defines an object that represents a request to the App Store for completion of a payment process.
SKPayment class defines an object that represents the payment process of App Store's items provided by the application.
SKPaymentQueue class defines a queue for the App Store's payment transactions of the application.
SKPaymentTransaction class defines an object that represents payment transaction objects of the payment queue.
SKPaymentTransactionState class defines different states of a transaction.
SKProduct class defines an object that represents a product of the App Store.
SKProductsRequest class defines an object that is used in order to request local information about products of the App Store.
SKProductsResponse class represents the list response that is returned by the Apple Store after a request of list of products.
SKRequest abstract class defines methods for handling requests send to the App Store.
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