Finding the repair boundary ยท reviewed 16 October 2026
The broken step may be before or after payment.
Cart behavior, checkout fields and provider updates are connected parts of one purchase. They are not interchangeable diagnoses.
Map the purchase in order
| Step | Question to answer |
|---|---|
| Product and cart | Are the intended options, quantity and discount retained? |
| Checkout | Can the shopper enter the required information and choose a valid delivery option? |
| Payment handoff | Does the provider receive the intended attempt and return an understandable result? |
| Store order | Is the intended order saved and updated to the expected state? |
| Follow-up | Do the agreed stock, confirmation and fulfillment actions happen? |
A page repair
If a control does not respond or validation blocks the correct input, the first investigation may be in the page or store code. Check the affected product and device rather than assuming every checkout is broken.
An integration repair
If payment and order states do not agree, follow the messages between the store and provider. A webhook is a server-to-server event message; it can be part of that update path. The integration needs to handle the relevant provider behavior reliably.
Sometimes the work spans more than one layer
A clear error message can help the shopper while a separate change repairs the saved order update. The scope should explain both, with controlled tests for the complete result.