Add Introductory Price to InAppBillingProduct

src/Plugin.InAppBilling.Abstractions/InAppBillingProduct.cs

@@ -41,6 +41,25 @@ public class InAppBillingProduct
         /// </summary>
         public Int64 MicrosPrice { get; set; }
 
+        /// <summary>
+        /// Gets or sets the localized introductory price.
+        /// </summary>
+        /// <value>The localized introductory price.</value>
+        public string LocalizedIntroductoryPrice { get; set; }
+
+        /// <summary>
+        /// Introductory price of the product in micor-units
+        /// </summary>
+        /// <value>The introductory price.</value>
+        public Int64 MicrosIntroductoryPrice { get; set; }
+
+        /// <summary>
+        /// Gets a value indicating whether this <see cref="T:Plugin.InAppBilling.Abstractions.InAppBillingProduct"/>
+        /// has introductory price. This is an optional value in the answer from the server, requires a boolean to check if this exists
+        /// </summary>
+        /// <value><c>true</c> if has introductory price; otherwise, <c>false</c>.</value>
+        public bool HasIntroductoryPrice => !string.IsNullOrEmpty(LocalizedIntroductoryPrice);
+
     }
 
 }

src/Plugin.InAppBilling.Android/InAppBillingImplementation.cs

@@ -105,7 +105,9 @@ public async override Task<IEnumerable<InAppBillingProduct>> GetProductInfoAsync
                 CurrencyCode = product.CurrencyCode,
                 LocalizedPrice = product.Price,
                 ProductId = product.ProductId,
-                MicrosPrice = product.MicrosPrice
+                MicrosPrice = product.MicrosPrice,
+                LocalizedIntroductoryPrice = product.IntroductoryPrice,
+                MicrosIntroductoryPrice = product.IntroductoryPriceAmountMicros
             });
         }
 
@@ -711,9 +713,21 @@ public Product()
             [JsonProperty(PropertyName = "price_amount_micros")]
             public Int64 MicrosPrice { get; set; }
 
-            public override string ToString()
-            {
-                return string.Format("[Product: Title={0}, Price={1}, Type={2}, Description={3}, ProductId={4}]", Title, Price, Type, Description, ProductId);
+            [JsonProperty(PropertyName = "introductoryPrice")]
+            public string IntroductoryPrice { get; set; }
+
+            // 0 is default if this property is not set
+            [JsonProperty(PropertyName = "introductoryPriceAmountMicros")]
+            public Int64 IntroductoryPriceAmountMicros { get; set; }
+
+            [JsonProperty(PropertyName = "introductoryPricePeriod")]
+            public string IntroductoryPricePeriod { get; set; }
+
+            [JsonProperty(PropertyName = "introductoryPriceCycles")]
+            public int IntroductoryPriceCycles { get; set; }
+
+            public override string ToString() {
+                return string.Format("[Product: Title={0}, Price={1}, Type={2}, Description={3}, ProductId={4}, CurrencyCode={5}, MicrosPrice={6}, IntroductoryPrice={7}, IntroductoryPriceAmountMicros={8}, IntroductoryPricePeriod={9}, IntroductoryPriceCycles={10}]", Title, Price, Type, Description, ProductId, CurrencyCode, MicrosPrice, IntroductoryPrice, IntroductoryPriceAmountMicros, IntroductoryPricePeriod, IntroductoryPriceCycles);
             }
         }
 

src/Plugin.InAppBilling.iOS/InAppBillingImplementation.cs

@@ -56,15 +56,18 @@ public async override Task<IEnumerable<InAppBillingProduct>> GetProductInfoAsync
 		{
 			var products = await GetProductAsync(productIds);
 
-			return products.Select(p => new InAppBillingProduct
-			{
-				LocalizedPrice = p.LocalizedPrice(),
-				MicrosPrice = (long)(p.Price.DoubleValue * 1000000d),
-				Name = p.LocalizedTitle,
-				ProductId = p.ProductIdentifier,
-				Description = p.LocalizedDescription,
-				CurrencyCode = p.PriceLocale?.CurrencyCode ?? string.Empty
-			});
+            var operatingSystemHasIntroductoryPrice = NSProcessInfo.ProcessInfo.IsOperatingSystemAtLeastVersion(new NSOperatingSystemVersion(11, 2, 0));
+
+            return products.Select(p => new InAppBillingProduct {
+                LocalizedPrice = p.LocalizedPrice(),
+                MicrosPrice = (long)(p.Price.DoubleValue * 1000000d),
+                Name = p.LocalizedTitle,
+                ProductId = p.ProductIdentifier,
+                Description = p.LocalizedDescription,
+                CurrencyCode = p.PriceLocale?.CurrencyCode ?? string.Empty,
+                LocalizedIntroductoryPrice = operatingSystemHasIntroductoryPrice && p.IntroductoryPrice != null ? p.IntroductoryPrice.LocalizedPrice() : "",
+                MicrosIntroductoryPrice = operatingSystemHasIntroductoryPrice && p.IntroductoryPrice != null ? (long)(p.Price.DoubleValue * 1000000d) : 0
+            });
 		}
 
 		Task<IEnumerable<SKProduct>> GetProductAsync(string[] productId)
@@ -537,5 +540,16 @@ public static string LocalizedPrice(this SKProduct product)
 			Console.WriteLine(" ** formatter.StringFromNumber(" + product.Price + ") = " + formattedString + " for locale " + product.PriceLocale.LocaleIdentifier);
 			return formattedString;
 		}
+
+        public static string LocalizedPrice(this SKProductDiscount product) {
+            var formatter = new NSNumberFormatter() {
+                FormatterBehavior = NSNumberFormatterBehavior.Version_10_4,
+                NumberStyle = NSNumberFormatterStyle.Currency,
+                Locale = product.PriceLocale
+            };
+            var formattedString = formatter.StringFromNumber(product.Price);
+            Console.WriteLine(" ** formatter.StringFromNumber(" + product.Price + ") = " + formattedString + " for locale " + product.PriceLocale.LocaleIdentifier);
+            return formattedString;
+        }
 	}
 }