/services/recommendation_service.proto

--- v22/services/recommendation_service.proto   2026-01-23 15:36:24.000000000 +0000
+++ v23/services/recommendation_service.proto   2026-01-23 15:36:33.000000000 +0000
@@ -752,6 +752,18 @@
   // CAMPAIGN_BUDGET
   optional int64 merchant_center_account_id = 20
       [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. Whether or not this customer should be treated as a "new"
+  // customer (that is, a customer who has not yet created a campaign).
+  //
+  // Setting this to `true` will cause the backend to generate recommendations
+  // using a dedicated recommendation model for onboarding new customers, as
+  // opposed to the default model for existing customers. This is only
+  // recommended for customers with 0 campaigns.
+  //
+  // This field is optional for the following recommendation_types:
+  // CAMPAIGN_BUDGET
+  optional bool is_new_customer = 21 [(google.api.field_behavior) = OPTIONAL];
 }

 // Response message for