Quote Originally Posted by ardhill View Post
Can I just check my understanding of those two variants please:

Express: When I am using the Zen Shopping cart, and just want people to be able to choose PayPal as one on the payment options.

Standard: When i want to use PayPal as my sole payment option.
No.

Standard is PayPal's OLD archaic method of bolting on paypal handling to an ecommerce store without properly integrating it into its functionality. It was designed to merely add paypal to static html pages, but has been crudely adapted to work on database-driven sites. It works, but is NOT recommended.

Express is the newer more contemporary way to accept payments, and allows transactions to complete inline while the customer is present at your store, thus resulting in immediate activation of the customer's order.