What should I fix before my first paying customer?
Before accepting real customer data or payments, review account access, tenant isolation, payment verification, exposed credentials and dependencies. Assign an owner to each confirmed issue and keep evidence of the tested fix. Prepare recovery and incident handling alongside the code review.
Who this is for: SaaS founders and small product teams moving from a working prototype to a paid product.
STEP 01
Protect the paths that move data and money
Begin with sign-in, account recovery, organization membership, exports and billing. Model the misuse that would hurt your customers: an ordinary member becoming an admin, an outsider downloading an export, or an unpaid account receiving a paid entitlement. Rank findings by reachability and impact rather than counting how many warnings a tool produces.
Try this: Write one denied-action test for each critical business flow before spending time on low-impact warnings.
STEP 02
Test payment events as untrusted input
A checkout success page is not evidence that a payment succeeded. Verify Stripe webhook signatures using the original request body and handle repeated event delivery without repeating the business action. Map the event to the intended customer and entitlement on the server. Test this flow with Stripe's testing tools before using live payments.
Try this: Test a valid event, an invalid signature and delivery of the same event twice. Confirm that access changes only as intended.
STEP 03
Know how to recover when prevention fails
A launch review should produce more than a score. Identify who can rotate a key, disable a risky feature, restore data and contact affected customers. Keep the release commit and remediation evidence available. If customers ask about compliance, distinguish implemented technical controls from organizational processes and independently assessed claims.
Try this: Assign an incident owner, test a backup restoration and record the decisions required before release.
Your review checklist
- Test account recovery and sensitive account changes.
- Prove that users cannot access another tenant's records.
- Verify payment signatures and duplicate-event handling.
- Rotate confirmed leaked secrets and restrict credential scope.
- Review resolved dependencies and apply tested fixes.
- Test recovery, assign incident ownership and retain release evidence.
What Bryxe can check
Bryxe helps find supported code risks, credential exposure and dependency advisories. Its Stripe audit and compliance readiness tools can contribute to a wider launch review.
What you still need to verify
A scan result is not a launch approval or a compliance certificate. Recovery, production access, supplier risk and legal obligations require information beyond the source code.
Common questions
Which vulnerabilities should block a SaaS launch?
Treat confirmed exposed production credentials, reachable cross-tenant access and unauthorized payment or privilege changes as urgent release blockers. Evaluate remaining findings using exposure, customer impact and available mitigations.
Does Stripe Checkout secure my whole payment flow?
Hosted Checkout handles its part of payment collection. Your application still needs to verify relevant server events and update the correct customer's entitlement safely. Test duplicate and invalid events as well as successful payment.
Does a security scan make my SaaS GDPR or SOC 2 compliant?
No. A scanner can support technical readiness and evidence collection. Regulatory obligations, organizational controls and independent assurance extend beyond code findings and depend on the service's scope.
Documentation & further reading
These primary sources explain the platform behavior discussed above. Check the documentation for the versions and configuration you use.