Cardinity provides easy-to-install modules for the most popular e-commerce systems:
For custom e-commerce systems Cardinity also provides PHP, JAVA and Symfony programming libraries. In addition, Cardinity API integration is available and well documented, allowing any e-commerce system to use Cardinity; however, some additional programming is required.
Here you can find additional resources that may help you in the process and tell you more about payment processing.
If you haven't found answers to your questions here or need any further assistance, don't hesitate to contact us.