The Clave method works for services Off-Site (Outside your website).
Our service with which it is integrated is Payment Link. Most of our integrations with the different eCommerce have Off-site form, and you can make use of this method.
Important to know:
If you use Prestashop, Opencart, VirtueMart, Magento V.1, just go to the settings and switch to Offsite mode.
If you use Shopify, you use the "PagueloFacil Visa and Mastercard" method, the key method is already included. We leave you here the Shopify guide.
In case you are developing your own eCommerce and/or application, check our payment link documentation and integrate.