@java.lang.Override
    protected Builder newBuilderForType(
        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
      Builder builder = new Builder(parent);
      return builder;
    }
<pre>
Required. The desired format of the notification message payloads.
</pre>

<code>
.google.storagetransfer.v1.NotificationConfig.PayloadFormat payload_format = 3 [(.google.api.field_behavior) = REQUIRED];
</code>

@return The payloadFormat.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java