complete my script in PHP to to manage orders Ebay

Hello I have a PHP / MySQL script that takes care of downloading orders from ebay I need an expert person to complete some things in the script. The script currently downloads orders from ebay but there are some things that do not work or that are not there and must be checked and completed. These are the things to check and complete in the script 1) I have to download from eBay all orders received pending shipment, orders are downloaded from ebay but some fields are not there and some fields are not complete with the requested data 2) I must be able to update the order on ebay from my script by entering the shipping code after the package has been shipped 3) when I download an order you must download all the products that are part of the order and all the details for each product must be downloaded from eBay 4) I have to download from ebay all the information of the user who placed the order, including his e-mail to be able to send an e-mail to the customer when I sent the order you must have your ebay account to do the job the script connects with ebay through these variables <EBayAuthToken> X-EBAY-API-DEV-NAME X-EBAY-API-CERT-NAME X-EBAY-API-APP-NAME N.B. I do not provide my ebay account !!! Thank you all for your cooperation