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.
You can use Custom HTML module application for creating modules or plug in for your website. This is very good application.