ecommerce optimization in PHP

Hello freelancers, I have an existing store that needs to be fixed. There are some issues with the payment process and I need someone to go in an redo it. The following needs to be done: - i need to connect paypal with the database through the paypal funcionality so that when someone pays something, it show as paid in the database - connectgin easypay to the database and make sure everything is working when someone pays a product, it shows as paid - make sure that notes are attached to the payment, in case people have some important messages to the seller - make sure that when a product is shipped, an email is sent with the order details, plus details from the buyer in the sites script; - make sure that when something in shipped, the seller can change the status of the product to sent;