Authorize.net is a terminal, not a merchant account. A terminal is also a physical card swipe system. Authorize.net is the internet version.
As for cartmanager, can it be integrated into Auctiva? As far as I can tell, no. Then it likely won't be integratable into eBay's new system. If eBay will let any website be a checkout buffer, then about anyone could make lots of much more inexpensive websites and do it. For instance, get a cheap managed VPS host and then buy cheap .info domains that are usually about $5 each and that's a buffer, too.
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