Add "is_upgraded" properties for ReceiptItem

Sources/SwiftyStoreKit/InAppReceipt.swift

@@ -69,6 +69,7 @@ extension ReceiptItem {
         } else {
             self.isInIntroOfferPeriod = false
         }
+        self.isUpgraded = receiptInfo["is_upgraded"] as? Bool ?? false
     }
 
     private static func parseDate(from receiptInfo: ReceiptInfo, key: String) -> Date? {

Sources/SwiftyStoreKit/SwiftyStoreKit+Types.swift

@@ -219,7 +219,10 @@ public struct ReceiptItem: Purchased, Codable {
     /// Indicates whether or not the subscription item is currently within an intro offer period.
     public var isInIntroOfferPeriod: Bool
     
-    public init(productId: String, quantity: Int, transactionId: String, originalTransactionId: String, purchaseDate: Date, originalPurchaseDate: Date, webOrderLineItemId: String?, subscriptionExpirationDate: Date?, cancellationDate: Date?, isTrialPeriod: Bool, isInIntroOfferPeriod: Bool) {
+    /// An indicator that a subscription has been canceled due to an upgrade. This field is only present for upgrade transactions.
+    public var isUpgraded: Bool
+    
+    public init(productId: String, quantity: Int, transactionId: String, originalTransactionId: String, purchaseDate: Date, originalPurchaseDate: Date, webOrderLineItemId: String?, subscriptionExpirationDate: Date?, cancellationDate: Date?, isTrialPeriod: Bool, isInIntroOfferPeriod: Bool, isUpgraded: Bool) {
         self.productId = productId
         self.quantity = quantity
         self.transactionId = transactionId
@@ -231,6 +234,7 @@ public struct ReceiptItem: Purchased, Codable {
         self.cancellationDate = cancellationDate
         self.isTrialPeriod = isTrialPeriod
         self.isInIntroOfferPeriod = isInIntroOfferPeriod
+        self.isUpgraded = isUpgraded
     }
 }
 

Tests/SwiftyStoreKitTests/InAppReceiptTests.swift

@@ -34,8 +34,8 @@ private extension TimeInterval {
 
 extension ReceiptItem: Equatable {
 
-    init(productId: String, purchaseDate: Date, subscriptionExpirationDate: Date? = nil, cancellationDate: Date? = nil, isTrialPeriod: Bool = false, isInIntroOfferPeriod: Bool = false) {
-        self.init(productId: productId, quantity: 1, transactionId: UUID().uuidString, originalTransactionId: UUID().uuidString, purchaseDate: purchaseDate, originalPurchaseDate: purchaseDate, webOrderLineItemId: UUID().uuidString, subscriptionExpirationDate: subscriptionExpirationDate, cancellationDate: cancellationDate, isTrialPeriod: isTrialPeriod, isInIntroOfferPeriod: isInIntroOfferPeriod)
+    init(productId: String, purchaseDate: Date, subscriptionExpirationDate: Date? = nil, cancellationDate: Date? = nil, isTrialPeriod: Bool = false, isInIntroOfferPeriod: Bool = false, isUpgraded: Bool = false) {
+        self.init(productId: productId, quantity: 1, transactionId: UUID().uuidString, originalTransactionId: UUID().uuidString, purchaseDate: purchaseDate, originalPurchaseDate: purchaseDate, webOrderLineItemId: UUID().uuidString, subscriptionExpirationDate: subscriptionExpirationDate, cancellationDate: cancellationDate, isTrialPeriod: isTrialPeriod, isInIntroOfferPeriod: isInIntroOfferPeriod, isUpgraded: isUpgraded)
         self.productId = productId
         self.quantity = 1
         self.purchaseDate = purchaseDate
@@ -47,6 +47,7 @@ extension ReceiptItem: Equatable {
         self.webOrderLineItemId = UUID().uuidString
         self.isTrialPeriod = isTrialPeriod
         self.isInIntroOfferPeriod = isInIntroOfferPeriod
+        self.isUpgraded = isUpgraded
     }
 
     var receiptInfo: NSDictionary {