@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(accessToken_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, accessToken_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(2, getExpireTime());
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Time at which the generated token will expire.
</pre>

<code>.google.protobuf.Timestamp expire_time = 2;</code>
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/GenerateAccessTokenResponse.java