[EN] Annotations

• [EN]PurchaseClient.ConnectionState

• [EN]PurchaseClient.FeatureType

• [EN]PurchaseClient.ProductType

• [EN]PurchaseClient.RecurringAction

• [EN]PurchaseClient.ResponseCode

• [EN]PurchaseData.AcknowledgeState

• [EN]PurchaseData.PurchaseState

• [EN]PurchaseData.RecurringState

• [EN]PurchaseFlowParams.ProrationMode