/enums/business_message_provider.proto 

--- v22/enums/business_message_provider.proto   2026-03-19 17:15:54.000000000 +0000
+++ v23/enums/business_message_provider.proto   2026-03-19 17:16:01.000000000 +0000
@@ -39,5 +39,11 @@

     // WhatsApp message provider
     WHATSAPP = 2;
+
+    // Facebook Messenger message provider
+    FACEBOOK_MESSENGER = 3;
+
+    // Zalo message provider
+    ZALO = 4;
   }
 }