@java.lang.Override
        public int getSerializedSize() {
          int size = memoizedSize;
          if (size != -1) return size;

          size = 0;
          if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(targetAudienceClientId_)) {
            size +=
                com.google.protobuf.GeneratedMessageV3.computeStringSize(
                    1, targetAudienceClientId_);
          }
          size += getUnknownFields().getSerializedSize();
          memoizedSize = size;
          return size;
        }
<pre>
Required. Describes OAuth2 client id of resources protected by
Identity-Aware-Proxy (IAP).
</pre>

<code>string target_audience_client_id = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

@return The bytes for targetAudienceClientId.
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1/src/main/java/com/google/cloud/websecurityscanner/v1/ScanConfig.java