A public domain is used in the documentation. ["your-company.com"](https://github.com/search?q=repo%3AAdyen%2Fadyen-openapi%20your-company.com&type=code) Please see https://www.whois.com/whois/your-company.com You could use "your-company.example" instead https://www.rfc-editor.org/rfc/rfc2606.html#page-2