Software coded for 3 x API's

BUDGET £800 Please read carefully and detail you experience, questions and approach to this project. I need a central piece of software coded for three APIs(all are properly documented), ALOT of experience in linking API's is essential ... any experience with TRADEBYTE and/or WEMALO would be even better. My brand just got approved to start selling on Zalando as a partner brand. So it's kind of a dropshipping model: Zalando sells my product, they then send the order information through an integrator (Tradebyte). I'm working with a fulfilment partner / warehouse which will ship the order to the end consumer. The warehouse has a system called Wemalo. Wemalo and Tradebyte both have APIs but are at the moment not yet connected. Tradebyte should send order data to Wemalo. Wemalo should send stock data, order status updates (tracking nr's etc.) and data on returns back to Tradebyte. Then to add: we're also selling via our own Shopify store. Shopify and Wemalo are connected, however the connection is not 100% friction-less. For example returns data is not communicated properly and also in my opinion the stock updates should be made more often than once a day. Especially once we start selling on Zalando and after that hopefully more market places, it's crucial that also Shopify runs smoothly. So basically a central piece of software needs to be coded. All three APIs are properly documented, so for someone with experience it should hopefully not provide too many obstacles. From my side I'd prefer it if the piece of software can be coded in Python or another "simple" language. So I can read along and make tiny adjustments myself when needed in the future, which will hopefully give some more flexibility in the future. The documentation for Wemalo: [login to view URL] [login to view URL] Shopify:[login to view URL] Tradebyte: For Tradebyte there is a whole lot of manuals. you can create a FREE account of your own and then I think it's easiest if you just click around yourself;f? Apparently the most interesting part for order processing is here: "Manuals for [login to view URL] chapter 7 you will find the information on order processing" So the focus should be for us on the order processing between Tradebyte and Wemalo. I saw also in "manuals for channels" there might be some interesting manuals. All the other functionality of TB are not the main focus for now, like setting up articles or the data exchange between TB and market place X. We need:- Order data TB > Wemalo- Order status update Wemalo > TB ("success" and tracking number)- Returns once received Wemalo > TB (order # and which products)- Stock levels updated several times per day. Wemalo > TB BUDGET £800