Upload yuupay.php and yuupay_lib to the /wp-content/plugins/wp-e-commerce/merchants directory
Make sure there are 1 new file ('yuupay.php') and 1 folder ('yuupay_lib').
Configure you YuuPay at WordPress admin -> (WP E-commerce) Store Settings -> Payment Options
Check YuuPay on the left List and click Update.
Select YuuPay on the right list, and there will be a form to fill :
5.1 Display name : Name that will be displayed in the payment/checkout options.
5.2 YuuPay MID : Your YuuPay Merchant ID.
5.3 YuuPay Server Host : Don't change the default value.
5.4 Enable 4G Secure : Additional Security from 4G Secure.
Click update to save the changes.
Requires: 3.0.3 or higher Compatible up to: WordPress 3.0.3 with WP E-Commerce Plugin 3.7.8 (without any upgrades/themes) Last Updated: 2011-2-8 Downloads: 717