diff --git a/CHANGELOG.md b/CHANGELOG.md
index a2358184..20a955b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Unreleased
 
--
+- [added] Implemented the `SendAllAsync()` and `SendMulticastAsync()` APIs in
+  the `FirebaseMessaging` class.
 
 # v1.2.1
 
diff --git a/FirebaseAdmin/FirebaseAdmin.Snippets/FirebaseMessagingSnippets.cs b/FirebaseAdmin/FirebaseAdmin.Snippets/FirebaseMessagingSnippets.cs
index 8817d539..436de0ae 100644
--- a/FirebaseAdmin/FirebaseAdmin.Snippets/FirebaseMessagingSnippets.cs
+++ b/FirebaseAdmin/FirebaseAdmin.Snippets/FirebaseMessagingSnippets.cs
@@ -14,6 +14,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
 using FirebaseAdmin.Messaging;
 
@@ -117,6 +118,107 @@ internal static async Task SendDryRunAsync()
             // [END send_dry_run]
         }
 
+        internal static async Task SendAllAsync()
+        {
+            var registrationToken = "YOUR_REGISTRATION_TOKEN";
+            // [START send_all]
+            // Create a list containing up to 100 messages.
+            var messages = new List<Message>()
+            {
+                new Message()
+                {
+                    Notification = new Notification()
+                    {
+                        Title = "Price drop",
+                        Body = "5% off all electronics",
+                    },
+                    Token = registrationToken,
+                },
+                new Message()
+                {
+                    Notification = new Notification()
+                    {
+                        Title = "Price drop",
+                        Body = "2% off all books",
+                    },
+                    Topic = "readers-club",
+                },
+            };
+
+            var response = await FirebaseMessaging.DefaultInstance.SendAllAsync(messages);
+            // See the BatchResponse reference documentation
+            // for the contents of response.
+            Console.WriteLine($"{response.SuccessCount} messages were sent successfully");
+            // [END send_all]
+        }
+
+        internal static async Task SendMulticastAsync()
+        {
+            // [START send_multicast]
+            // Create a list containing up to 100 registration tokens.
+            // These registration tokens come from the client FCM SDKs.
+            var registrationTokens = new List<string>()
+            {
+                "YOUR_REGISTRATION_TOKEN_1",
+                // ...
+                "YOUR_REGISTRATION_TOKEN_n",
+            };
+            var message = new MulticastMessage()
+            {
+                Tokens = registrationTokens,
+                Data = new Dictionary<string, string>()
+                {
+                    { "score", "850" },
+                    { "time", "2:45" },
+                },
+            };
+
+            var response = await FirebaseMessaging.DefaultInstance.SendMulticastAsync(message);
+            // See the BatchResponse reference documentation
+            // for the contents of response.
+            Console.WriteLine($"{response.SuccessCount} messages were sent successfully");
+            // [END send_multicast]
+        }
+
+        internal static async Task SendMulticastAndHandleErrorsAsync()
+        {
+            // [START send_multicast_error]
+            // These registration tokens come from the client FCM SDKs.
+            var registrationTokens = new List<string>()
+            {
+                "YOUR_REGISTRATION_TOKEN_1",
+                // ...
+                "YOUR_REGISTRATION_TOKEN_n",
+            };
+            var message = new MulticastMessage()
+            {
+                Tokens = registrationTokens,
+                Data = new Dictionary<string, string>()
+                {
+                    { "score", "850" },
+                    { "time", "2:45" },
+                },
+            };
+
+            var response = await FirebaseMessaging.DefaultInstance.SendMulticastAsync(message);
+            if (response.FailureCount > 0)
+            {
+                var failedTokens = new List<string>();
+                for (var i = 0; i < response.Responses.Count; i++)
+                {
+                    if (!response.Responses[i].IsSuccess)
+                    {
+                        // The order of responses corresponds to the order of the registration tokens.
+                        failedTokens.Add(registrationTokens[i]);
+                    }
+                }
+
+                Console.WriteLine($"List of tokens that caused failures: {failedTokens}");
+            }
+
+            // [END send_multicast_error]
+        }
+
         internal static Message CreateAndroidMessage()
         {
             // [START android_message]
diff --git a/FirebaseAdmin/FirebaseAdmin/Messaging/SendResponse.cs b/FirebaseAdmin/FirebaseAdmin/Messaging/SendResponse.cs
index d94806e8..6b4e3471 100644
--- a/FirebaseAdmin/FirebaseAdmin/Messaging/SendResponse.cs
+++ b/FirebaseAdmin/FirebaseAdmin/Messaging/SendResponse.cs
@@ -44,9 +44,9 @@ private SendResponse(FirebaseException exception)
 
         /// <summary>
         /// Gets a value indicating whether the send operation was successful or not. When this property
-        /// is <see langword="true"/>, <see cref="MessageId"/> is guaranteed to return a
-        /// non-<see langword="null"/> value. When this property is <see langword="false"/>,
-        /// <see cref="Exception"/> is guaranteed to return a non-<see langword="null"/> value.
+        /// is <c>true</c>, <see cref="MessageId"/> is guaranteed to return a
+        /// non-null value. When this property is <c>false</c>,
+        /// <see cref="Exception"/> is guaranteed to return a non-null value.
         /// </summary>
         public bool IsSuccess => !string.IsNullOrEmpty(this.MessageId);