Added support for analytics_label

.gitignore

@@ -2,3 +2,4 @@ bin/
 obj/
 .vscode/
 .vs/
+.idea/

FirebaseAdmin/FirebaseAdmin/FirebaseAdmin.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Version>1.7.0</Version>

FirebaseAdmin/FirebaseAdmin/Messaging/AndroidConfig.cs

@@ -66,6 +66,12 @@ public sealed class AndroidConfig
         [JsonProperty("notification")]
         public AndroidNotification Notification { get; set; }
 
+        /// <summary>
+        /// Gets or sets the FCM options to be included in the message.
+        /// </summary>
+        [JsonProperty("fcm_options")]
+        public FcmOptions FcmOptions { get; set; }
+
         /// <summary>
         /// Gets or sets the string representation of <see cref="Priority"/> as accepted by the FCM
         /// backend service.

FirebaseAdmin/FirebaseAdmin/Messaging/ApnsConfig.cs

@@ -35,6 +35,12 @@ public sealed class ApnsConfig
         [JsonProperty("headers")]
         public IReadOnlyDictionary<string, string> Headers { get; set; }
 
+        /// <summary>
+        /// Gets or sets the FCM options to be included in the message.
+        /// </summary>
+        [JsonProperty("fcm_options")]
+        public FcmOptions FcmOptions { get; set; }
+
         /// <summary>
         /// Gets or sets the <c>aps</c> dictionary to be included in the APNs payload.
         /// </summary>

FirebaseAdmin/FirebaseAdmin/Messaging/FcmOptions.cs

@@ -0,0 +1,16 @@
+using Newtonsoft.Json;
+
+namespace FirebaseAdmin.Messaging
+{
+    /// <summary>
+    /// Represents FCM options.
+    /// </summary>
+    public class FcmOptions
+    {
+        /// <summary>
+        /// Gets or sets analytics label.
+        /// </summary>
+        [JsonProperty("analytics_label")]
+        public string AnalyticsLabel { get; set; }
+    }
+}

FirebaseAdmin/FirebaseAdmin/Messaging/Message.cs

@@ -80,6 +80,12 @@ public sealed class Message
         [JsonProperty("apns")]
         public ApnsConfig Apns { get; set; }
 
+        /// <summary>
+        /// Gets or sets the FCM options to be included in the message.
+        /// </summary>
+        [JsonProperty("fcm_options")]
+        public FcmOptions FcmOptions { get; set; }
+
         /// <summary>
         /// Gets or sets the formatted representation of the <see cref="Topic"/>. Removes the
         /// <c>/topics/</c> prefix if present. This is what's ultimately sent to the FCM