docs: A comment for field custom_attributes in message .google.shopping.merchant.reviews.v1beta.MerchantReview is changed

docs: A comment for field `review_language` in message `.google.shopping.merchant.reviews.v1beta.MerchantReviewAttributes` is changed
docs: A comment for field `content` in message `.google.shopping.merchant.reviews.v1beta.ProductReviewAttributes` is changed
feat: A new field `is_verified_purchase` is added to message `.google.shopping.merchant.reviews.v1beta.ProductReviewAttributes`
feat: A new field `is_incentivized_review` is added to message `.google.shopping.merchant.reviews.v1beta.ProductReviewAttributes`

PiperOrigin-RevId: 781457438

google/shopping/merchant/reviews/v1beta/merchantapi_v1beta.yaml

@@ -51,8 +51,6 @@ publishing:
       common:
         destinations:
         - PACKAGE_MANAGER
-    cpp_settings:
-      common: {}
     php_settings:
       common:
         destinations:

google/shopping/merchant/reviews/v1beta/merchantreviews.proto

@@ -176,7 +176,7 @@ message MerchantReview {
   MerchantReviewAttributes attributes = 3
       [(google.api.field_behavior) = OPTIONAL];
 
-  // Required. A list of custom (merchant-provided) attributes. It can also be
+  // Optional. A list of custom (merchant-provided) attributes. It can also be
   // used for submitting any attribute of the data specification in its generic
   // form (for example,
   // `{ "name": "size type", "value": "regular" }`).
@@ -188,7 +188,7 @@ message MerchantReview {
   // size of 102.4kB. Underscores in custom attribute names are replaced by
   // spaces upon insertion.
   repeated google.shopping.type.CustomAttribute custom_attributes = 4
-      [(google.api.field_behavior) = REQUIRED];
+      [(google.api.field_behavior) = OPTIONAL];
 
   // Output only. The primary data source of the merchant review.
   string data_source = 5 [(google.api.field_behavior) = OUTPUT_ONLY];

google/shopping/merchant/reviews/v1beta/merchantreviews_common.proto

@@ -107,8 +107,8 @@ message MerchantReviewAttributes {
   optional google.protobuf.Timestamp review_time = 14
       [(google.api.field_behavior) = REQUIRED];
 
-  // Required. The language of the review defined by BCP-47 language code.
-  optional string review_language = 15 [(google.api.field_behavior) = REQUIRED];
+  // Optional. The language of the review defined by BCP-47 language code.
+  optional string review_language = 15 [(google.api.field_behavior) = OPTIONAL];
 
   // Optional. The country where the reviewer made the order defined by ISO
   // 3166-1 Alpha-2 Country Code.

google/shopping/merchant/reviews/v1beta/productreviews_common.proto

@@ -121,8 +121,9 @@ message ProductReviewAttributes {
   // Optional. The title of the review.
   optional string title = 11 [(google.api.field_behavior) = OPTIONAL];
 
-  // Required. The content of the review.
-  optional string content = 12 [(google.api.field_behavior) = REQUIRED];
+  // Optional. The content of the review. If empty, the content might still get
+  // populated from pros and cons.
+  optional string content = 12 [(google.api.field_behavior) = OPTIONAL];
 
   // Optional. Contains the advantages based on the opinion of the reviewer.
   // Omit boilerplate text like "pro:" unless it was written by the reviewer.
@@ -183,6 +184,14 @@ message ProductReviewAttributes {
   // system.
   optional bool is_spam = 27 [(google.api.field_behavior) = OPTIONAL];
 
+  // Optional. Indicates whether the reviewer's purchase is verified.
+  optional bool is_verified_purchase = 30
+      [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. Indicates whether the review is incentivized.
+  optional bool is_incentivized_review = 31
+      [(google.api.field_behavior) = OPTIONAL];
+
   // Optional. The method used to collect the review.
   CollectionMethod collection_method = 28
       [(google.api.field_behavior) = OPTIONAL];