We need a website that will import order information from Lengow API

We need a website that will import order information from Lengow API. Lengow allows us to list to multiple marketplaces across the world and get the orders in one place. except their order management system is crap. I would like a website that doesnt need to be visually anything special but it allows us to log on and print orders in bulk. Hopefully it will allow us to accept orders from various marketplaces automatically and just let us print a list of invoices and shipping labels in bulk (from a set invoice template we already have) When we have printed the invoices we can set as dispatched and this will update the Lengow system. I have attached the lengow links so you can read it properly. It apparently is quite easy to do so its not going to be a big project. In the actual invoice I would like certain parameters to show eg Title SKU quantity Image of product Address of buyer etc. This is a predefined html invoice. So ideally a nice backend that links with lengow api, has a log in for security. we have about 200k sku (or soon will have) on lengow. [login to view URL] I think it plugs in Magento if that helps but whatver is best we will go for.