Custom OpenCart Payment Gateway

Dear future Developers, I need you to develop a payment gateway for OpenCart. Following parameters sent by OpenCart can be processed by the Payment site: · member - username on the Payment site · product - product ID or name · action - (use "product" if this product is pre-defined) - not needed in this project (use "donation" if this is donation payment) - not needed in this project (use "subscription" if this product is subscription) - not needed in this project use "payment" if this is simple payment transaction · price - price of product · quantity - quantity · (period - subscription rebilling period, days) - not needed in this project · (trial - trial period, days) - not needed in this project · (setup - setup fee) - not needed in this project · tax - tax fee · shipping - shipping fee · ureturn - return URL · unotify - notify URL · ucancel - cancel URL · comments - product description After a successful transaction the payment site will return the buyer to the site specified in the "ureturn" variable, and will send notification to a php script specified in the "unotify" variable. If the transaction is cancelled, the buyer will be sent to the url specified in the "ucancel" variable. These parameters will be sent to the "unotify" script, which parameters can be accessed by the global $_POST[--VARIABLE-NAME--]: · action - type of transaction (product/donation/subscription/payment) · pid - internal product ID · pname - product name · buyer - buyer username on the payment site · total - total amount · quantity - quantity · comments - buyer notes · referer - system referer URL (to avoid fraud) As you see, the job is pretty easy, but since I only know PHP and don't have a clue about OpenCart Payment gateways, my loss is your gain, you can make good money on this. Happy coding :)