public Builder setCustomAccount(
          com.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.CustomAccount.Builder
              builderForValue) {
        if (customAccountBuilder_ == null) {
          authentication_ = builderForValue.build();
          onChanged();
        } else {
          customAccountBuilder_.setMessage(builderForValue.build());
        }
        authenticationCase_ = 2;
        return this;
      }
<pre>
Authentication using a custom account.
</pre>

<code>
.google.cloud.websecurityscanner.v1.ScanConfig.Authentication.CustomAccount custom_account = 2;
</code>
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1/src/main/java/com/google/cloud/websecurityscanner/v1/ScanConfig.java