private com.google.protobuf.SingleFieldBuilderV3<
            com.google.apps.events.subscriptions.v1.PayloadOptions,
            com.google.apps.events.subscriptions.v1.PayloadOptions.Builder,
            com.google.apps.events.subscriptions.v1.PayloadOptionsOrBuilder>
        getPayloadOptionsFieldBuilder() {
      if (payloadOptionsBuilder_ == null) {
        payloadOptionsBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.apps.events.subscriptions.v1.PayloadOptions,
                com.google.apps.events.subscriptions.v1.PayloadOptions.Builder,
                com.google.apps.events.subscriptions.v1.PayloadOptionsOrBuilder>(
                getPayloadOptions(), getParentForChildren(), isClean());
        payloadOptions_ = null;
      }
      return payloadOptionsBuilder_;
    }
<pre>
Optional. Options about what data to include in the event payload. Only
supported for Google Chat events.
</pre>

<code>
.google.apps.events.subscriptions.v1.PayloadOptions payload_options = 6 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-workspaceevents/proto-google-cloud-workspaceevents-v1/src/main/java/com/google/apps/events/subscriptions/v1/Subscription.java