- Here's an instruction page for getting the PayPal side set up for Express Checkout: http://www.zen-cart.com/getpaypal
- Admin->Modules->Payment
- Click on PayPal Express Checkout
- Fill in the fields. For the API Signature etc info, use what you gathered during the PayPal account setup phase.
- Do a test transaction.
There's a lot more reading on setting up the PayPal IPN module here:
http://www.zen-cart.com/wiki/index.php/PayPal
If you haven't already, you should get yourself a copy of the eStart Your Web Store with Zen Cart book. It deals with this and many other aspects of setup.
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