I have a site on Joomla 2.5 with hikashop 1.5 and for recurring payment from eway payment gateway I have custom code on file /plugins/hikashoppayment/eway/eway.php, and this is working perfectly on my one live site www.clet.edu.au
Now I have another site on joomla 3.3 with hikashop 2.3 and I want to use same previous custom code for same file /plugins/hikashoppayment/eway/eway.php, so how can I integrate existing custom code in current site please help me how to do this for joomla 3.3 plugin.