Retail • E-commerce • Fintech
Checkout and Payment Reliability
Protect conversion-critical checkout, tax, promo, and payment workflows from production regressions.
Challenge
Small checkout bugs silently hurt revenue and are often discovered by customers first. A pricing calculation that rounds incorrectly, a promo code that fails to apply, or a payment method that errors on a specific card type can go unnoticed for days — costing thousands in lost transactions. These flows are also among the hardest to test because they span multiple services: cart logic, tax engines, payment gateways, and order management systems.
Stably approach
Stably automates end-to-end purchase paths across cart, discounts, shipping, tax, and payment flows with production-like assertions. AI assertions can verify that totals, taxes, and discounts render correctly on the page — not just that the right DOM elements exist. Variables and fixtures let you test across payment methods, currencies, and edge cases like expired cards or invalid promo codes. Run these tests on every deploy to catch revenue-impacting regressions before they reach customers.
What changes
AI reads your checkout page like a customer would
Instead of checking DOM selectors, Stably's AI assertions verify the rendered page: "the order total is $47.99 with tax and the promo code SAVE20 is applied." If the total is wrong or the discount is missing, the test fails with a plain-English explanation of what looked wrong.
One test covers Visa, Mastercard, Apple Pay, and the expired card edge case
Variables and fixtures let you parameterize payment tests. The same checkout flow runs with different card numbers, billing addresses, and currencies — including the edge cases that manual QA always forgets, like a declined card or a mismatched ZIP code.
Broken promo codes are caught before the marketing launch
Run your checkout suite against the staging URL before every deploy. If a code change breaks the BOGO logic or a tax calculation, the deploy is blocked — not discovered by angry customers tweeting about it.
Cart-to-confirmation tested end-to-end, not in isolated units
Stably tests the full journey: add to cart, apply discount, enter shipping, calculate tax, submit payment, and verify confirmation. No gaps between unit-tested services — the same flow your customer experiences.
When this is the right fit
- Revenue drops appear after pricing or checkout changes
- Payment, promo, or tax issues are found late
- Teams rely on ad hoc smoke checks before launch
- Checkout spans multiple services that are tested in isolation but not end-to-end