diff --git a/README.md b/README.md
index 84b40aa..aee7351 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ A software development kit to provide ways to interact with CM.com's Text servic
 ### Instantiate the client
 Using your unique `ApiKey` (or product token) which authorizes you on the CM platform. Always keep this key secret!
 
+The product token can be found in the [Channels](https://www.cm.com/app/channels) application on the platform, under the `Gateway` section.
+
 ```php
 $client = new \CMText\TextClient('your-api-key');
 ```
diff --git a/src/CMText/Channels.php b/src/CMText/Channels.php
index 474cd52..ba6bbc6 100644
--- a/src/CMText/Channels.php
+++ b/src/CMText/Channels.php
@@ -49,9 +49,16 @@ class Channels
     /**
      * Send Apple Business Chat messages.
      * @note CM needs to configure this with you.
+     * @deprecated instead use APPLEMESSAGESFORBUSINESS
      */
     const IMESSAGE = 'iMessage';
 
+    /**
+     * Send Apple Messages For Business messages.
+     * @note CM needs to configure this with you.
+     */
+    const APPLEMESSAGESFORBUSINESS = 'Apple Messages for Business';
+
     /**
      * Send Line messages.
      * @note CM needs to configure this with you.
@@ -87,4 +94,10 @@ class Channels
      * @note CM needs to configure this with you.
      */
     const INSTAGRAM = 'Instagram';
+
+    /**
+     * Send Telegram messages.
+     * @note CM needs to configure this with you.
+     */
+    const TELEGRAM = 'Telegram Messenger';
 }
\ No newline at end of file
diff --git a/src/CMText/Message.php b/src/CMText/Message.php
index 7de3ee3..f17c420 100644
--- a/src/CMText/Message.php
+++ b/src/CMText/Message.php
@@ -31,6 +31,11 @@ class Message implements JsonSerializable
     /**
      * @var string Sender name
      * @note Twitter requires the snowflake-id of the account you want to use as sender
+     * @note MobilePush: use the app key of the account you want to use as sender.
+     * @note Facebook Messenger: use the Facebook Page ID of the account you want to use as sender.
+     * @note Google Business Messages: use the Google Business Messages agent ID of the account you want to use as sender (without dashes).
+     * @note Instagram: use the Instagram Account ID of the account you want to use as sender.
+     * @note Telegram: use the Telegram Bot ID of the account you want to use as sender.
      */
     private $from;
 
@@ -42,6 +47,10 @@ class Message implements JsonSerializable
     /**
      * @var array List of Recipients
      * @note Twitter requires the snowflake-id
+     * @note Facebook Messenger: use the Facebook Page Scoped User ID (PSID).
+     * @note Google Business Messages: use the Google Business Messages conversation ID (without dashes).
+     * @note Instagram: use the Instagram Scoped User ID (IGSID).
+     * @note Telegram: use the Telegram Chat ID.
      */
     private $to = [];