FinTech API Testing Case Study
Business valuations and appraisals for SBA lenders and banks.
Industry — FinTech
FinTech Software Testing & Development
In FinTech a broken flow means lost money or exposed data — we test payments, security and onboarding so every release is safe to ship.
Risks we eliminate
01
Failed or duplicated transactions
We test payment flows for double charges, timeouts, partial failures and refunds.
02
Security gaps exposing financial data
We check authentication, authorisation and data handling against OWASP guidance.
03
KYC and onboarding drop-off
Broken identity checks lose customers at sign-up. We test every onboarding path end to end.
Payments & transactions
We test every money movement in sandbox environments, including the unhappy paths. Timeouts, retries and duplicate requests get as much attention as successful payments.
API Testing Services →What we test
- Card, wallet and bank transfer flows
- Duplicate and idempotent requests
- Refunds, chargebacks and reversals
- Currency, rounding and fee calculations
- Ledger and balance reconciliation
Tools
- Postman
- Playwright
- k6
- Stripe test mode
Security & PCI DSS readiness
We run OWASP-aligned security testing on your web and mobile apps and APIs. Findings are ranked by risk with clear steps to fix, helping your team prepare for audits.
Security Testing Services →What we test
- Authentication and session handling
- Authorisation and access to other accounts
- Sensitive data in storage, logs and traffic
- Injection and input validation
- Mobile app storage and transport security
Tools
- OWASP ZAP
- Burp Suite
- MobSF
KYC & onboarding
We test onboarding on real devices with the identity-verification providers you use. Every path is covered, including rejected documents, retries and manual review.
Mobile App Testing Services →What we test
- Document and selfie capture on real devices
- Approved, rejected and pending outcomes
- Resuming an interrupted sign-up
- Field validation and error messages
- Accessibility of onboarding screens
Tools
- Appium
- BrowserStack
- Playwright
Standards we test against
- Testing that supports your PCI DSS readiness
- Testing that supports your OWASP Top 10 readiness
- Testing that supports your GDPR readiness
- Testing that supports your WCAG 2.2 readiness
Full-stack delivery for FinTech
A1Flagship
QA Testing
Payment, security and regression testing for financial products.
A4
Mobile Development
Banking and payment apps built and tested on real devices.
A3
Web Development
Customer portals and back-office dashboards built for reliability.
A2
AI Apps & Integration
AI assistants and automation for support and operations, tested for safety.
How we work with FinTech teams
Timezone
Daily overlap with US and EU working hours
FinTech FAQ
How do you test payment flows without real money?+
We use your payment providers' sandbox and test modes with test cards and accounts. Where a sandbox can't reproduce a case, we agree a controlled approach with your team before touching production.
How do you handle sensitive financial data during testing?+
We work with test or masked data wherever possible, use only the access you grant, and never copy production data to our own systems. Access is removed when the engagement ends.
Do you perform security testing?+
Yes. We run OWASP-aligned security testing on web apps, mobile apps and APIs, and report each finding with its risk level and recommended fix.
Do you sign NDAs before accessing our systems?+
Yes. An NDA is signed before we receive any access, and we request only the minimum permissions needed for the work.