public static com.google.apps.events.subscriptions.v1.UpdateSubscriptionRequest parseFrom(
      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
  }
<pre>
Optional. If set to `true`, validates and previews the request, but doesn't
update the subscription.
</pre>

<code>bool validate_only = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The validateOnly.
java-workspaceevents/proto-google-cloud-workspaceevents-v1/src/main/java/com/google/apps/events/subscriptions/v1/UpdateSubscriptionRequest.java