/services/reach_plan_service.proto

--- v18/services/reach_plan_service.proto   2025-08-05 14:36:13.000000000 +0000
+++ v19/services/reach_plan_service.proto   2025-08-05 14:36:21.000000000 +0000
@@ -47,6 +48,25 @@
   option (google.api.default_host) = "googleads.googleapis.com";
   option (google.api.oauth_scopes) = "https://www.googleapis.com/auth/adwords";

+  // Returns a collection of conversion rate suggestions for supported plannable
+  // products.
+  //
+  // List of thrown errors:
+  //   [AuthenticationError]()
+  //   [AuthorizationError]()
+  //   [HeaderError]()
+  //   [InternalError]()
+  //   [QuotaError]()
+  //   [RequestError]()
+  rpc GenerateConversionRates(GenerateConversionRatesRequest)
+      returns (GenerateConversionRatesResponse) {
+    option (google.api.http) = {
+      post: "/v19:generateConversionRates"
+      body: "*"
+    };
+    option (google.api.method_signature) = "customer_id";
+  }
+
   // Returns the list of plannable locations (for example, countries).
   //
   // List of thrown errors:
@@ -107,7 +127,43 @@
 }

 // Request message for
-// [ReachPlanService.ListPlannableLocations][google.ads.googleads.v18.services.ReachPlanService.ListPlannableLocations].
+// [ReachPlanService.GenerateConversionRates][google.ads.googleads.v19.services.ReachPlanService.GenerateConversionRates].
+message GenerateConversionRatesRequest {
+  // Required. The ID of the customer. A conversion rate based on the historical
+  // data of this customer may be suggested.
+  string customer_id = 1 [(google.api.field_behavior) = REQUIRED];
+
+  // The name of the customer being planned for. This is a user-defined value.
+  optional string customer_reach_group = 2;
+}
+
+// Response message for
+// [ReachPlanService.GenerateConversionRates][google.ads.googleads.v19.services.ReachPlanService.GenerateConversionRates],
+// containing conversion rate suggestions for supported plannable products.
+message GenerateConversionRatesResponse {
+  // A list containing conversion rate suggestions. Each repeated element will
+  // have an associated product code. Multiple suggestions may share the same
+  // product code.
+  repeated ConversionRateSuggestion conversion_rate_suggestions = 1;
+}
+
+// A conversion rate suggestion.
+message ConversionRateSuggestion {
+  // Model type used to calculate the suggested conversion rate.
+  google.ads.googleads.v19.enums.ReachPlanConversionRateModelEnum
+      .ReachPlanConversionRateModel conversion_rate_model = 1;
+
+  // The code associated with the plannable product (for example: DEMAND_GEN).
+  // To list all plannable product codes, use
+  // [ReachPlanService.ListPlannableProducts][google.ads.googleads.v19.services.ReachPlanService.ListPlannableProducts].
+  string plannable_product_code = 2;
+
+  // The suggested conversion rate. The value is between 0 and 1 (exclusive).
+  double conversion_rate = 3;
+}
+
+// Request message for
+// [ReachPlanService.ListPlannableLocations][google.ads.googleads.v19.services.ReachPlanService.ListPlannableLocations].
 message ListPlannableLocationsRequest {}

 // The list of plannable locations.
@@ -372,9 +428,16 @@
   // For example: 1 000 000$ = 1 000 000 000 000 micros.
   optional int64 budget_micros = 4 [(google.api.field_behavior) = REQUIRED];

+  // Conversion rate as a decimal between 0 and 1, exclusive.
+  // For example: if 2% of ad interactions are expected to lead to conversions,
+  // conversion_rate should be 0.02.
+  // This field is required for DEMAND_GEN plannable products. It is not
+  // supported for other plannable products.
+  optional double conversion_rate = 6;
+
   // Targeting settings for the selected product.
   // To list the available targeting for each product use
-  // [ReachPlanService.ListPlannableProducts][google.ads.googleads.v18.services.ReachPlanService.ListPlannableProducts].
+  // [ReachPlanService.ListPlannableProducts][google.ads.googleads.v19.services.ReachPlanService.ListPlannableProducts].
   AdvancedProductTargeting advanced_product_targeting = 5;
 }

@@ -472,6 +535,13 @@
   // See https://support.google.com/google-ads/answer/2375431 for
   // more information on views.
   optional int64 views = 15;
+
+  // The number of conversions.
+  // This metric is only available for DEMAND_GEN plannable products.
+  //
+  // See https://support.google.com/google-ads/answer/2375431 for
+  // more information on conversions.
+  optional double conversions = 16;
 }

 // The forecasted allocation and traffic metrics for a specific product
@@ -554,6 +624,13 @@
   // See https://support.google.com/google-ads/answer/2375431 for
   // more information on views.
   optional int64 views = 11;
+
+  // The number of conversions.
+  // This metric is only available for DEMAND_GEN plannable products.
+  //
+  // See https://support.google.com/google-ads/answer/2375431 for
+  // more information on conversions.
+  optional double conversions = 12;
 }

 // Audience metrics for the planned products.