public static Builder newBuilder() {
    return DEFAULT_INSTANCE.toBuilder();
  }
<pre>
Optional. next_page_token value returned from a previous List request, if
any.
</pre>

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

@return The bytes for pageToken.
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/ListUsableWorkstationConfigsRequest.java