The site does not need a cassette， unless the site requires real-time credit card validation.
A cassette is a piece of plug-in software that provides support for a specific payment system.
The CyberCash cassette is installed by default， with the installation of WebSphere Commerce Payments.
Third party companies can create custom cassettes that will work with WebSphere Commerce Payments.
Cassettes convert the merchant payment request to the payment protocol of the local payment system.