Failure and root cause
The workflow treated a read followed by a write as if the pair were atomic. It also relied on delivery history alone, even though two different delivery IDs can request the same irreversible action for one order.
Self-produced repair example
Sample automation repair handoff
A duplicate Shopify order action can be created when two webhook executions both pass a normal lookup before either writes the result. This sample shows the diagnosis, repair pattern, tests, and monitoring a customer should expect.
What this is: a self-produced technical demonstration of the handoff format. It is not a client result, exported production workflow, testimonial, revenue claim, uptime claim, or guarantee.
Repair pattern
- Require a stable delivery ID and business-action key.
- Reserve the business action atomically in durable storage.
- Allow only the execution that created the reservation to continue.
- Reuse the same key with downstream idempotent APIs.
- Record processing, completed, or needs-review status.
Verified acceptance checks
| Check | Expected behavior | Local harness |
|---|---|---|
| First valid delivery | Reserve and complete once | Passed |
| Exact webhook redelivery | Block before side effect | Passed |
| Different delivery ID, same order | Block the repeated business action | Passed |
| Different order | Accept normally | Passed |
| Missing stable identifier | Fail closed | Passed |
| Failed side effect | Hold for controlled review | Passed |
| Eight-delivery burst | Accept exactly one reservation | Passed |
Monitoring handoff
- Alert on actions stuck in processing.
- Review every needs-review record before retrying.
- Track blocked duplicates separately from failures.
- Repeat success, failure, missing-field, and burst checks after changes.
Production boundary
The demonstration uses an in-memory harness. A real repair must use an atomic database constraint, transaction, Redis operation, or idempotent downstream API in the customer’s authorized environment. If that guard cannot be added safely, the work stops at diagnosis and receives a separate rebuild quote.
Have one broken workflow?
Run the triage tool locally, then review the fixed $149 repair scope before ordering. Larger rebuilds need a separate quote.