multi-channel selling is it available via shopify account? like vendio, channeladvisor...
furthermore, is it possible? just add new item in shopify account, then automatically add new listing of same item to my ebay.com account and possiblely other ebay accounts on (ebay.co.uk, ebay.de, ...)
then, if the final qty of an item sold on either site, all listing of the same products on different site will be automatically ended.
While I think this may be possible via the EBAY API, this would involve a pretty complicated custom application creation. There is a lot involved here. Are you submitting as an auction? to a store? If an auction how long is the auction? Buy it now? Start price etc etc etc. So the answer is probably a yes, but it would take significant resources in my humble opinion to pull the app off.
This is something I've been thinking about building, albeit in a locked down way - ie most variables are based entirely on whats set in the store, and the remainder are set on a global basis.
There's the obvious issue of offsetting development (and operating costs) with the value of such an app... eBay's costs are significant enough, so would we charge per auction posted, per month and if so, to what extent? We wouldn't expect a massive uptake of users, so to justify the building of an app, how much would you be willing to pay, versus the time it takes to post the item by hand?
Is the tradeoff there? I have a wishlist of functions like this for Shopify and for many other key apps, and it often comes down to that very tradeoff. If there's enough interest then hell yeah, justification is there...