Magento 1: Nocks
Nocks payment gateway for Magento 1
The Nocks Magento 1 plugin is installed by manually adding the repository files to your Magento installation. Therefore download the latest package from the release tab and merge these folder/files with your Magento installation.
After adding all the module files, flush the Magento cache in System > Cache Management to enable the module. Afterwards go to System > Configuration > Sales > Payment Methods > Nocks Module to configure the module.