Implement storefront

src/Plugin.InAppBilling/InAppBilling.apple.cs

@@ -18,9 +18,10 @@ public class InAppBillingImplementation : BaseInAppBilling
         internal static bool HasIntroductoryOffer => UIKit.UIDevice.CurrentDevice.CheckSystemVersion(11, 2);
         internal static bool HasProductDiscounts => UIKit.UIDevice.CurrentDevice.CheckSystemVersion(12, 2);
         internal static bool HasSubscriptionGroupId => UIKit.UIDevice.CurrentDevice.CheckSystemVersion(12, 0);
+        internal static bool HasStorefront => UIKit.UIDevice.CurrentDevice.CheckSystemVersion(13, 0);
         internal static bool HasFamilyShareable => UIKit.UIDevice.CurrentDevice.CheckSystemVersion(14, 0);
 #else
-		static bool initIntro, hasIntro, initDiscounts, hasDiscounts, initFamily, hasFamily, initSubGroup, hasSubGroup;
+		static bool initIntro, hasIntro, initDiscounts, hasDiscounts, initFamily, hasFamily, initSubGroup, hasSubGroup, initStore, hasStore;
 		internal static bool HasIntroductoryOffer
         {
 			get
@@ -37,7 +38,23 @@ internal static bool HasIntroductoryOffer
 
 			}
         }
-		internal static bool HasProductDiscounts
+        internal static bool HasStorefront
+        {
+            get
+            {
+                if (initStore)
+                    return hasStore;
+
+                initStore = true;
+
+
+                using var info = new NSProcessInfo();
+                hasStore = info.IsOperatingSystemAtLeastVersion(new NSOperatingSystemVersion(10, 15, 0));
+                return hasStore;
+
+            }
+        }
+        internal static bool HasProductDiscounts
         {
 			get
             {
@@ -101,6 +118,16 @@ public override void PresentCodeRedemption()
 #endif
         }
 
+        Storefront storefront;
+        /// <summary>
+        /// Returns representation of storefront on iOS 13+
+        /// </summary>
+        public override Storefront Storefront => HasStorefront ? (storefront ??= new Storefront
+        {
+            CountryCode = SKPaymentQueue.DefaultQueue.Storefront.CountryCode,
+            Id = SKPaymentQueue.DefaultQueue.Storefront.Identifier
+        }) : null;
+
         /// <summary>
         /// Gets if user can make payments
         /// </summary>

src/Plugin.InAppBilling/Plugin.InAppBilling.csproj

@@ -127,4 +127,5 @@
   <ItemGroup Condition=" $(TargetFramework.Contains('-mac')) ">
     <Compile Include="**\*.apple.cs" />
   </ItemGroup>
+
 </Project>

src/Plugin.InAppBilling/Shared/BaseInAppBilling.shared.cs

@@ -11,6 +11,12 @@ namespace Plugin.InAppBilling
 
     public abstract class BaseInAppBilling : IInAppBilling, IDisposable
     {
+
+        /// <summary>
+        /// Gets a representation of the storefront
+        /// </summary>
+        public virtual Storefront Storefront { get; } = null;
+
         /// <summary>
         /// Gets if the user can make payments
         /// </summary>

src/Plugin.InAppBilling/Shared/IInAppBilling.shared.cs

@@ -5,11 +5,11 @@
 
 namespace Plugin.InAppBilling
 {
-	/// <summary>
-	/// Interface for InAppBilling
-	/// </summary>
-	[Preserve(AllMembers = true)]
-	public interface IInAppBilling : IDisposable
+    /// <summary>
+    /// Interface for InAppBilling
+    /// </summary>
+    [Preserve(AllMembers = true)]
+    public interface IInAppBilling : IDisposable
     {
         /// <summary>
         /// Determines if it is connected to the backend actively (Android).
@@ -20,6 +20,11 @@ public interface IInAppBilling : IDisposable
         /// </summary>
         bool InTestingMode { get; set; }
 
+        /// <summary>
+        /// Represenation of the storefront if available
+        /// </summary>
+        Storefront Storefront { get; }
+
 
         /// <summary>
         /// Manually acknowledge a purchase

src/Plugin.InAppBilling/Shared/Storefront.shared.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Plugin.InAppBilling
+{
+    /// <summary>
+    /// An object containing the location and unique identifier of an App Store storefront.
+    /// </summary>
+    public class Storefront
+    {
+        /// <summary>
+        /// A value defined by Apple that uniquely identifies an App Store storefront.
+        /// </summary>
+        public string Id { get; set; }
+        /// <summary>
+        /// The three-letter code representing the country or region associated with the App Store storefront.
+        /// </summary>
+        public string CountryCode { get; set; }
+    }
+}