The customer paid, but the order still says unpaid
Use payment webhook reconciliation to recover paid orders after lost redirects or delayed events. Verify the original payment and make updates repeatable.
AI Commerce
“Something like this, but cheaper”: build a useful product search
Build AI product search that respects budget, size and availability. Separate hard filters from ranking and test the decision flow with Node.js.
Your shopping assistant recommends stock you no longer have
Keep AI shopping assistant inventory accurate without making every lookup live. Build freshness checks and revalidate stock before committing an order.
Two customers buy the last item. Reserve stock without overselling.
Build an inventory reservation Node.js example with conditional updates, unique request IDs and safe release. Test the last-item failure locally.
One seller rejects part of an order. What happens to the payment?
Handle an order saga partial failure with item-level states and explicit compensation. Test partial fulfilment and one-time refund intent in Node.js.
The cart changed after you sent a payment link. Which price applies?
Use versioned checkout quotes to keep carts, discounts and payment amounts aligned. Test quote expiry and amount validation in a Node.js example.