Shopify inventorySetQuantities: A Practical Guide (2026)
If your ERP, WMS or spreadsheet is the source of truth for stock, inventorySetQuantities is the Shopify mutation you want. It sets an absolute number ("this item has 42 available at this location") rather than adding or subtracting. The catch is that it changed twice this year, so most of the examples floating around the internet no longer work.
