PHP api developer to test api integration and some changes required

Looking for a PHP API developer to test this api integration that been implemented on my site [login to view URL] the API is here at [login to view URL] What it does: (Used for auto order submission from this site [login to view URL] to [login to view URL] ) Basically the order details are passed through website and paypal IPN and with that information a order is submitted to the server which is at here [login to view URL] ,this site uses this api [login to view URL] which i have used to connect it with my site. Things which iam looking for : 1)Test this API response with paypal sandbox details ,for this you should have a paypal sandbox login details to check the payment flow and the result api response which is sent when successful. 2) After checking the API response i would require some customization in it ,this is the response which is sent to customers automatically. 3) There are some few more things which i can discuss with you in details via pm telling you the exact flow and the things that are required. If you have previous experiences with PHP and api integration that you are welcome to apply for this job . Thanks!