Hyperspace e-Commerce Software

Small business with direct customer sales, started e-Commerce a few years back, and now at the point of looking at how to integrate it all better. Older inventory/used trade-in from upgrading customers/etc on eBay. Sometimes that may get sold to a customer directly if rep/they are needing/looking for a part that may not be in new inventory.

Anyone have any experience with Hyperspace? Perhaps moving to Spotify, and told it works well together. A big thing that is wanted/needed is to have inventory uploaded/removed, no matter where it's bought. Not putting new stuff on eBay, but if a used product is sold directly or off business website it is adjusted accordingly no matter where it's sold. Hope that makes sense.

Also, I had question about ShipStation post on the MB. Got a couple really helpful responses, but maybe this board will get more traction. So if anyone has idea if there is good Shopify/Hyperspace/ShipStation integration. If all 3 are needed

Any other ideas to look at would be appreciated too. TIA.