API workflow verification
API workflow verification to fix broken logic
API workflows for a charge, a refund, a cancellation or an offboarding step often crosses a processor, a ledger and the system that grants access. When failures happen, they cost money and reputation.
The service We use formal verification to check the retry, timeout and webhook sequences that leave those systems disagreeing, before that sequence reaches production.
Tell us about one workflow
The repair work that keeps returning, costing money and reputation
Costly failures are often a result of operations that span a few systems and then stop halfway. Paid, but no access. Cancelled, but still billed. A refund that never settles. An order taken after the stock was gone.
As engineers, we describe these issues as race conditions, partial failure, ambiguous timeouts and events that arrive out of order. The people who feel it talk about support escalations, delayed payouts and broken trust. They come with a cost to the business and a cost to reputation.
If the repair is recurring, the workflow is worth checking.
Retries don't fix broken logic or satisfy the business rule
Idempotency keys, queues, webhook gateways, workflow engines and compensating actions all earn their place. They recover a transient failure, deliver an event again, or remember how far a workflow got.
None of that, on its own, checks the rule across the whole operation. A durable workflow can resume the wrong cancellation. A late webhook, delivered reliably, can restore access after the subscription was terminated.
Verification sits beside these tools and asks whether the business rule still holds.
Let us prove it to you
A review of one critical workflow
We take one workflow whose failure costs you money, orders or access. You get the sequences that break it, not a catalogue of every API you own.
-
Pick a high-stakes workflow
You hire us to take a close look at one critical process where errors are costly.
-
Define the rules
We sit down with you to clearly map out how the process should work and what assumptions we can make about the outside services you use.
-
Build a digital model
We create a precise logical model of your workflow to test it mathematically.
-
Stress-test for worst-case scenarios
We simulate glitches: network dropouts, system timeouts, or multiple events happening at the exact same time, to see where the logic breaks down.
-
Deliver proof and fixes
If we find a flaw, we provide a step-by-step example showing exactly how the failure happens (a counterexample trace) along with executable code tests to prevent it from happening in production.
Who benefits from API workflow verification?
Teams whose next incident is already a familiar repair.
-
Payments and subscriptions
Hospitality, booking, property and commerce software.
-
Checkout, inventory and fulfilment
A paid order can still go unfulfilled.
-
Identity and access
Offboarding or revocation has to land in more than one system.
Built on vericoding
Vericoding is the method. People review the specification, and the check is against that specification rather than against a sample of tests. The same standard is how we prove a security component or a document workflow.
Start here
Tell us about one workflow
Which operation crosses more than one system, and which repair your team still does by hand.
Email the team
[email protected]Book a call with our CEO, Gavin Mendel-Gleason
Book a call