private com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential
                    .IapTestServiceAccountInfo,
                com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential
                    .IapTestServiceAccountInfo.Builder,
                com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential
                    .IapTestServiceAccountInfoOrBuilder>
            getIapTestServiceAccountInfoFieldBuilder() {
          if (iapTestServiceAccountInfoBuilder_ == null) {
            if (!(iapCredentialsCase_ == 1)) {
              iapCredentials_ =
                  com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential
                      .IapTestServiceAccountInfo.getDefaultInstance();
            }
            iapTestServiceAccountInfoBuilder_ =
                new com.google.protobuf.SingleFieldBuilderV3<
                    com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential
                        .IapTestServiceAccountInfo,
                    com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential
                        .IapTestServiceAccountInfo.Builder,
                    com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential
                        .IapTestServiceAccountInfoOrBuilder>(
                    (com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential
                            .IapTestServiceAccountInfo)
                        iapCredentials_,
                    getParentForChildren(),
                    isClean());
            iapCredentials_ = null;
          }
          iapCredentialsCase_ = 1;
          onChanged();
          return iapTestServiceAccountInfoBuilder_;
        }
<pre>
Authentication configuration when Web-Security-Scanner service
account is added in Identity-Aware-Proxy (IAP) access policies.
</pre>

<code>
.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.IapCredential.IapTestServiceAccountInfo iap_test_service_account_info = 1;
</code>
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1/src/main/java/com/google/cloud/websecurityscanner/v1/ScanConfig.java