If you sell the same product on your own Shopify store and on Amazon.in (and maybe Flipkart), you have one stock pool and two or three places claiming a count of it. Inventory sync is the work of keeping those counts honest.
The three ways sellers do it
| Approach | What it looks like | What breaks |
|---|---|---|
| Manual | Upload a stock file each morning and evening | Anything sold between uploads |
| Marketplace-to-marketplace plugin | A tool copies one channel's count to the other | Neither channel knows the real warehouse stock |
| Warehouse as the source of truth | The WMS owns stock, and pushes a number to each channel | Needs the WMS to be accurate, which is the point |
The third approach is the only one that survives sale days, because the number that matters is the one on the shelf, not the one a storefront last saw.
What a good sync pushes
- Available stock: on hand minus what's already allocated to open orders.
- A safety buffer: a few units held back for damages, offline orders and counting errors.
- A channel share: if you'd rather Amazon never takes more than 60% of a SKU, say so.
- A zero threshold: below a minimum, show zero everywhere instead of risking a cancellation.
Read how to stop overselling across Shopify, Amazon and Flipkart for the arithmetic.
Orders flow the other way
Sync isn't only stock going out. Orders come in through webhooks (Shopify) or polling (Amazon), and need to be matched to your own SKU codes, including bundles that are really several products. Anything that can't be matched should be parked with a reason, not dropped. Waretech keeps every marketplace order in a sync ledger so you can fix and requeue it.
Don't forget the paperwork and status
- Invoices: Amazon may expect your invoice against each order. Upload it automatically.
- Tracking: push the AWB back to the channel so customers see their tracking.
- Cancellations: if a customer cancels, stock should return to the pool.
How Waretech does it
Waretech connects to Shopify and Amazon (10 marketplaces including Amazon.in), with Flipkart in early access. Stock rules are set per channel connection, and the warehouse stays the source of truth. Book a demo to see it on your own SKUs.