Overselling is the fastest way to lose a customer and a marketplace rating. The cause is almost always the same: each channel keeps its own copy of stock.
One stock pool, many channels
The fix is a single source of truth for inventory that every channel reads from and writes to in real time. When an order lands on Amazon, availability updates on Shopify and eBay within seconds.
Handling reservations and buffers
Smart buffers and reservation logic protect against race conditions during peak periods, ensuring you never promise stock you cannot fulfil.