Payment System Penetration Testing

What a Payment System Pentest Checks

A payment platform is a chain: checkout, gateway, acquirer, issuer, back-office, reconciliation. A serious test walks the whole chain and attacks every hop.

✓ Payment gateways — API auth, request signing, webhook handling, replay protection
✓ Acquiring — 3-D Secure flows, capture and refund logic, partial reversals
✓ Card data — PAN/CVV storage, tokenization, leaks in logs, PCI DSS scope gaps
✓ OTP and 2FA — bypass, code replay, race conditions on verification
✓ Business logic — amount and currency tampering, negative amounts, double-spend on cashout
✓ Back-office — admin and agent panels, mass assignment, escalation to payment approval

Why Banks and Fintech Need It

For a bank, a payment flaw is direct money loss, card scheme fines and a regulator conversation. Scanners do not see your state machine: they will not catch a refund issued twice, or a support agent approving their own transfer.

✓ Regulatory pressure — PCI DSS and central bank audits demand proof, not a scan log
✓ One race on withdrawal can drain a float account overnight
✓ Merchants and card schemes ask for independent test reports before integration

Penetration testing services · Banking & finance security · Pricing

How a Payment System Pentest Runs

1 Mapping — data flows from checkout to settlement, every role that can touch money
2 Attack simulation — gateway abuse, parameter tampering, OTP and 3-D Secure bypass, races on financial operations
3 Manual verification — every finding proven with a working request and a negative control
4 Report — severity, proof-of-concept, code-level fix, PCI DSS mapping

What You Get

A report your engineers can fix from and your auditor can read: each flaw rated by real financial impact, reproducible proof-of-concept for critical and high findings, remediation at code and configuration level, and a retest of everything patched. Focused payment scope delivers in 1–2 weeks; full gateway plus back-office plus card-data work takes longer.

FAQ

Do we need to give you production access?

No. A staging environment that mirrors payment logic is enough for most findings. Live-only checks get an agreed window and a kill switch.

Will testing move real money?

Only in agreed test accounts. Race and double-spend checks use isolated fixtures, never customer balances.

Does this cover PCI DSS?

The report maps findings to PCI DSS requirements and flags scope-reduction options. Formal certification stays a separate QSA process.

Test the Money Path Before Someone Else Does

Send us your payment architecture — scoped proposal within 48 hours.

Request a Payment Pentest