Track inventory with quantity_max and the transaction webhook

How to set it up

1. 1

   Add the quantity_max attribute to your product’s add-to-cart link or form, and set its value to the product’s current inventory level. This prevents a single customer from ordering more of that product than you currently have in stock.

2. 2

   Set up a transaction webhook for your store. Foxy sends a summary of each completed transaction to your endpoint, which you can use to decrease your inventory record for each product sold.

3. 3

   Update quantity_max on your product links or forms whenever your inventory levels change, so the cart always reflects accurate stock.

Notes

• This approach works well for stores with low transaction volume, where the chances of two customers checking out for the same item at the same time are low, or where occasional overselling isn’t a major concern.

• quantity_max only limits how many of a product a single customer can add to their own cart — it doesn’t reserve stock for that customer, so two customers could still complete overlapping orders for the same limited stock. If you need to prevent that, see Confirm inventory before checkout with the pre-payment webhook or Set up advanced inventory tracking with inventory locks.

• See the transaction webhook payload reference for the full list of data included in each transaction summary.