Connect Paypal/COD payment to existing website // PHP

Hello, The following website is being upgraded: [login to view URL] The existing website already contain Paypal/COD payment options. We have built an upgraded version of the same website which you may view on the following site: [login to view URL] Both website use the same database structure! However, due to personal reason, I am unable to complete the newsite. Basically, the following needs to be done: 1. Make the PHP code to handle the COD/Paypal payment. -> This should involve adding the transaction in the required table. If COD -> payment status will be 0, if paypal, payment_status will be 1 if payment successfully. 2. Invoice delivery once Order has been placed or Paypal is successful. Given that we are using the same database structure, we can provide the code of the existing site, which will really help you. You may then just modify the existing code to adapt it to the current site. I am looking for an experienced PHP developper who can do the work neat and quick! Thanks.