How Do I Do It?
Don't forget to check the Zen Cart tutorials on the Zen Cart site!
How do I find the right information to set up Authorize.net as my payment provider in Zen Cart?
How do I set up attributes / options for my products?
How do I get the settings for Paypal's Express Checkout?
After logging into your PayPal account, click on profile. If you can see columns of links, click on API Access under Account Information. If you have the new interface, click on My Selling Tools on the left hand side and then on API Access. Choose option 2 - to create an api signature. Copy the API username, password and signature for use in the paypal express module.
We also have some free tutorials on our AllThingsZenCart.com site which features documentation for the Zen Cart admin.