I am trying to install plugins. One of the sections relates to the payment gateways. I will be using authorize.net for visa, mc, discover and amex via 1shoppingcart. com. Which payment plugins do I need to select and which protected plugins do I need to check to protect these payment gateways? Is there any downside to selecting all of the choices? On another topic, what is a Postback password? I need this to configure 1shoppingcart. Thanks