When a unit sells on any channel, the true count drops once and every other channel is corrected before it can sell the same unit again. That single rule is what ends overselling.
GVANSH holds one authoritative stock figure per SKU. Shopify, Amazon, your offline POS and other marketplaces all subscribe to it. A sale, a receipt or a manual adjustment writes to that single figure, and the change propagates outward to every connected channel within a fraction of a second.
Because the write happens in one place, there is no race between channels arguing over who saw the last unit. The source decides, and the channels follow.
No network is instant. During the brief window while a change propagates, a channel could theoretically accept an order against stock that is already gone. GVANSH closes that window with a configurable buffer per channel: a thin reserve held back on faster-moving or slower-syncing channels so the last unit is never promised twice.
Channels subscribe to one count instead of keeping their own, so they can never drift apart.
A small held-back reserve absorbs propagation delay so the final unit is never double-sold.
Every movement carries its source and time, so reconciliation is a lookup, not an investigation.
Start a free trial and see every channel line up behind the same number.