2checkout has the following parameters:
• 2Checkout Vendor ID – a 2Checkout Vendor ID obtained during registration on 2Checkout.com.
• 2Checkout secret word – a 2Checkout secret word obtained from 2Checkout account setting.
• Demo mode - (yes) to turn on the 2Checkout test account.
To have 2checkout inform your system about status of payments (whether transactions have been completed successfully or not) and return to your website from the payment page configure the settings below.
Log in into your 2Checkout account and go to:
Look & Feel -> Settings -> Approved URL
Then set the following data there:
http://YOURSITE.com/system/payment/callback/2checkout
For more information about this gateway go to http://www.2checkout.com/