public com.google.protobuf.ByteString getTargetAudienceClientIdBytes() {
            java.lang.Object ref = targetAudienceClientId_;
            if (ref instanceof 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