Checkout, login, onboarding, and billing are high-stakes flows. Zerocheck runs approved browser tests for those flows and records what happened, while payment and email-provider helpers remain customer-authored in V1.
“I deployed a new checkout flow on Friday afternoon at 4:47 PM. After 6 minutes Slack exploded. Payment processing broke and customers couldn't complete purchases.”
DEV Communitysource
“I tried to buy your product three times. Your site kept failing. I went to your competitor instead.”
Optivem Journalsource
Average payment incident costs $12K+ in failed transactions
Stripe iframe testing is a universal pain point: Cypress can't handle cross-domain iframes
95%+ of companies skip magic link testing in CI entirely
Checkout flows often involve third-party services, redirects, and test-mode sandboxes. V1 should be framed around approved checkout and billing smoke tests, with deeper provider automation handled by customer-authored flows.
Email flows sit in a structural tooling gap. E2E tools can drive browsers but can't receive email. Email tools can receive email but can't drive browsers. Integration requires 2-4 hours of plumbing per project.
Checkout and email flows are high-stakes, but they are often covered by manual checks or skipped in CI.
Stripe ships a new Elements SDK version. Developer updates the package. Unit tests pass because Stripe is mocked. No E2E checkout test exists. Deployed Friday evening. Monday morning: 3% of payments failing. 3DS modal renders but the callback is broken. $12K in failed transactions before rollback.
Same checkout update. Zerocheck runs approved checkout and billing smoke tests on the PR. A blocking approved failure stops the merge, with screenshots, recording, and step trace for the engineer reviewing the change.
Author and approve safe checkout and billing smoke tests
Use customer-authored login setup for authenticated flows
Safe customer-authored payment-adjacent flows supported
Revenue math in the PR comment: what this test protects
Other tools document their own platform controls. Zerocheck produces JSON evidence from your executed application tests.
Get coverage on the flows customers will notice when they break, without turning testing into a quarter-long infrastructure project.
Guard the only code path where a bug is measured in lost dollars per minute.
V1 does not ship built-in Stripe or 3DS helpers, so you author the payment-field and 3DS steps yourself. Teams run approved tests for these flows against safe staging or test environments, and suggested tests stay in review until approved.
Do not give Zerocheck real payment data. Use safe staging/test environments and customer-authored flows for payment-adjacent coverage.
Built-in SMTP capture is not available in V1. Use customer-authored login setup, environment variables, or your own test inbox tooling for magic-link flows.
Zerocheck runs approved customer-authored browser tests for these flows against safe staging or test environments. You author the payment-specific steps, and suggested tests stay in review until you approve them.
Protect the flows that generate your revenue. Checkout, payments, onboarding, and email checked on every PR.
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