01Introduction
Any business that stores, processes or transmits payment card data answers to PCI DSS. Failing it can mean fines, higher processing fees or losing the ability to take cards.
02What is PCI DSS?
The Payment Card Industry Data Security Standard (PCI DSS) is a security standard maintained by the PCI Security Standards Council and enforced by the card brands. It sets 12 requirements for protecting cardholder data, covering network security, data protection, vulnerability management, access control, monitoring and testing.
Version 4.0, mandatory since 2025, adds requirements for targeted risk analysis, authenticated internal scanning and stronger authentication. It is especially relevant to fintech.
03How PCI DSS works
Compliance is validated annually, with continuous controls in between.
- 1.
Scope
Define the cardholder data environment and everything connected to it.
- 2.
Implement controls
Apply the 12 requirements, including logging to a SIEM and patch management timelines.
- 3.
Test
Quarterly vulnerability scans and at least annual penetration testing under Requirement 11, plus after significant changes.
- 4.
Validate
A Report on Compliance from a Qualified Security Assessor, or a Self-Assessment Questionnaire, depending on volume.
04Threats and risks
PCI failures and breaches share causes.
Scope creep
Systems that touch card data but were left out of scope and untested.
Web skimming
Malicious scripts injected into checkout pages. PCI DSS 4.0 added script controls for this.
Checkbox testing
Annual tests that pass while weekly releases introduce new flaws.
Weak segmentation
Segmentation controls that don't actually isolate the card environment.
05How Parameter helps
Parameter produces PCI pentest evidence continuously, not once a year. See PCI DSS penetration testing.
Requirement 11 coverage
The pentesting agents test application and API layers on every release.
Retest after change
Agents retest after significant changes and fixes, as the standard expects.
Supply chain and scripts
Supply Chain flags malicious packages that could skim card data.
