/enums/reach_plan_surface.proto 

--- v22/enums/reach_plan_surface.proto  2026-02-25 22:50:22.000000000 +0000
+++ v23/enums/reach_plan_surface.proto  2026-02-25 22:50:29.000000000 +0000
@@ -57,5 +57,8 @@

     // Shorts ad surface.
     SHORTS = 6;
+
+    // Google Display Network ad surface.
+    GOOGLE_DISPLAY_NETWORK = 9;
   }
 }