If you are using Opencart for your shopping cart and ccavenue as your payment gateway, there is a free plugin to install as Opencart payment module. Opencart ccavenue module is made by Bluezeal and available for download at ccavenue merchant dashboard. After installation, if you are facing callback issue, please see the solution given at http://www.bluezeal.in/support/kb/faq.php?id=3 page
Callback issue or blank page after successful payment. What’s this?
It may occur due to improper module download or installation.
Please rename the file:
catalog/view/theme/default/template/CAVEN~2.TPL to ccavenuepay_response.tpl
Kindly note that the .TPL file should be changed to .tpl file