This extension adds PayJunction as an optional payment method for magento. It is known to work on Magento v1.9 although it may work on earlier versions.
Download a released package and install from the command line:
$ ./mage install-file Payjunction_Magento-0.3.0.tgz
Install development dependencies
$ ./composer.phar install
If you want to work on this extension, then start with a working magento installation, clone this repository and run the dev task pointing it to your magento installation which in this case lives in ../magento-test:
$ ./bin/dev ../magento-test
When you're ready to build, run the build script and the new package will appear in ./dist:
$ ./bin/build