NOTE: This article assumes you already have the following:
• PayPal Business or Premier account
• ZenCart is installed
• You have already Enabled and configured PayPal Express Checkout inside ZenCart
Enabling Express Checkout Within Zencart Payment Modules
1. Log into your ZenCart admin. 
2. Hover over "Modules" and click on "Payment".

3. Click on “PayPal Express Checkout” in the Payment Modules list. Where prompted click “Install”
4. When Zencart asks if you want to enable this payment module you will select "true".

5. Scroll down to the section where it asks for the API Signature – Username, Password and Signature code. Enter the information from the end of step 1 and click the "Update" button.
Congratulations! Zencart is now ready to use PayPal Express Checkout.
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Last update: 2009-12-29 03:47
Author: Jason Scavarda
Revision: 1.0