public Builder clearExpirationTime() {
      bitField0_ = (bitField0_ & ~0x00000002);
      expirationTime_ = null;
      if (expirationTimeBuilder_ != null) {
        expirationTimeBuilder_.dispose();
        expirationTimeBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
The expiration time of the token.
</pre>

<code>.google.protobuf.Timestamp expiration_time = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/GenerateStreamHlsTokenResponse.java