eBay API Developer Needed Working With TNT Shipping

Hi everyone. Im looking for an eBay API developer to help maintain and manage a system we have had created. We had a previous developer create it all and it is working great. The developer has recently disappeared and we now need someone else to help fix things should there be an issue. Here is a bit of background of what we have in place: 1. We currently have 6 Australian eBay stores. Each eBay store is set up with an off-page calculator that automatically links up with TNT shipping. All the customer has to do is add their postcode and it will display the correct up to date price. Here is an example of the calculator working: [login to view URL] 2. On the same management system, we have automatic invoice set up. So when a client buys a product that requires shipping through eBay, the system is already set up to send them the invoice through eBay. This means it is automatically done straightaway and we don't have to come in and send. It knows the postcode due to the client's address. 3. Also on the same system, we have an auto-reply to message. So anytime a client sends a message through eBay asking for a shipping price for a product the system automatically replies with the correct price. 4. It is also linked up to our Opencart website so we can have a calculator on that. So these are the features we have, and they are all run from one management system. We need someone who knows what they are doing and who have had previous experience working with eBay API. At the moment we are needing one of the automatic invoices fixed on one of our stores. All the other stores work fine, but it is just this one store that was not set up properly. Please let me know if this is something you can do. We are looking for long-term relationship with reliable people