Fondy payment gateway provides tokenization technology within own Javascript SDK and Custom checkout product to help merchants to comply with PCI DSS when card form is located on merchant side.
You can find source code and documentation on JavaScript SDK on github: https://github.com/cloudipsp/ipsp-js-sdk . Custom checkout documentation and examples.
JavaScript SDK is a set of methods which allow developer to create own HTML card form on merchant web-site and submit sensitive credit card data to secure Fondy API using JavaScript without sending sensitive information to merchant server or network.
How it works you can find below on image:
After merchant receives token and masked PAN, it can use token for server-to-server recurring payments or one-click payments with own card form within JavaScript SDK.