CCAvenue API integration for backend in CS-Cart

We are running a eCommerce website based on [login to view URL] v4.2.x ecommerce software. we are using [login to view URL] payment gateway which is already integrated into our website and working perfectly. Now with ccavenue, after every order completion we need to send them confirmation after each order is completed or shipped. similarly, if there is a problem with the order then we can also request for cancellation or refund of the order. Right now we need to login to CCAvenue panel manually and do the needfull, which is a time consuming task if the number of order increases. we want to implement this operation via API, so that we have option to confirm, cancel or refund an order from the cs-cart backend itself (order details page). the order details page will have a new tab with name ccavenue with the required links to send updates or get statuses from ccavenue. i have also attached the API manual received from CCAvenue, which will help you do the needful. # a new tab with name CCAvenue will come up in order details page in backend # this tab will have options for "payment status", "confirm payments", "cancel payments" & "refund payments" # if "refund payment" is clicked, then admin is re-confirmed with a popup = "Are you sure you want to refund payment for this order?" # admin should be able to give rights to which admin can have access to this feature # tab is enabled only if the order is using that particular payment gateway # will be great if all actions can be logged # access key and ID can be managed in addon settings in "manage addon" page.