@java.lang.Override
        public final boolean isInitialized() {
          byte isInitialized = memoizedIsInitialized;
          if (isInitialized == 1) return true;
          if (isInitialized == 0) return false;

          memoizedIsInitialized = 1;
          return true;
        }
<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