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We are an eBay seller. We need design an API platform such as inkfrog and shipstation. It can download all the sales record from eBay or amazon, connect to UPS or USPS and ship, schedule the listing and include the CRM. It will use the API on eBay, amazon, UPS, USPS, Paypal.
The language we will use is most likely php, but other languages will be considered.