@java.lang.Override
        public com.google.protobuf.ByteString getTargetAudienceClientIdBytes() {
          java.lang.Object ref = targetAudienceClientId_;
          if (ref instanceof java.lang.String) {
            com.google.protobuf.ByteString b =
                com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
            targetAudienceClientId_ = b;
            return b;
          } else {
            return (com.google.protobuf.ByteString) ref;
          }
        }
<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