A single operation (create, update) on a recommendation subscription. [RecommendationSubscriptionService.MutateRecommendationSubscription]
| Fields | |
|---|---|
| 
 | Optional. FieldMask that determines which resource fields are modified in an update. | 
| Union field 
 | |
| 
 | Create operation: No resource name is expected for the new subscription. | 
| 
 | Update operation: The subscription is expected to have a valid resource name. |