/services/invoice_service.proto 

--- v22/services/invoice_service.proto  2026-01-23 15:36:24.000000000 +0000
+++ v23/services/invoice_service.proto  2026-01-23 15:36:33.000000000 +0000
@@ -74,8 +74,14 @@
   string issue_year = 3 [(google.api.field_behavior) = REQUIRED];

   // Required. The issue month to retrieve invoices.
-  google.ads.googleads.v22.enums.MonthOfYearEnum.MonthOfYear issue_month = 4
+  google.ads.googleads.v23.enums.MonthOfYearEnum.MonthOfYear issue_month = 4
       [(google.api.field_behavior) = REQUIRED];
+
+  // Optional. When true, the response will include more granular level invoice
+  // details such as campaign level cost breakdown, itemized regulatory costs
+  // and adjustments. The default value is false.
+  bool include_granular_level_invoice_details = 5
+      [(google.api.field_behavior) = OPTIONAL];
 }

 // Response message for