Can I use Paypal for payments with all shopping cart sotwares you offer?
Shopping carts do not actually process payments. But when you choose a shopping cart with PayPal built in, you will be able to use it for payments in your store. However, not every e-commerce software has built-in PayPal payment processor. For some application this functionality can be added with a plugin or extension. You should carefully review the documentation of your shopping cart software to be sure it supports PayPal payments.