Definition
An ASIN is Amazon’s 10-character identifier for a product in a marketplace catalogue. Sellers map their own SKUs to ASINs (and FNSKUs for FBA). Inventory planning for Amazon still needs your SKU and warehouse view; the ASIN is how Amazon’s listing and fee tools recognise the item.
Worked example
Your SKU TEE-BLK-M maps to ASIN B0EXAMPLE01 on Amazon UK. FBA units of that ASIN also get an FNSKU barcode Amazon scans in its network.
Why it matters for replenishment
Restock limits, IPI and inbound shipments are Amazon-side. Matching ASIN ↔ SKU stops you from sending the wrong variant or double-counting demand.
How OmniRestock uses this
OmniRestock connects Amazon via SP-API and maps FBA and FBM catalogue data into your warehouse model so forecasts stay per SKU.