Executive Summary
Payment aggregators carry cardholder data and heavy regulator and acquirer scrutiny. This case (client name withheld under NDA) shows how CyberSigma reduced the assessed environment and reached PCI DSS v4.0.1 readiness.
Client Overview
The client is a payment aggregator processing card transactions for multiple merchants, facing PCI DSS v4.0.1 requirements from acquirers.
- Industry: Payments / Fintech
- Region: India
- Scope: Cardholder data environment (v4.0.1)
Challenge
Cardholder data sprawled across systems, inflating the assessment. The aggregator needed to meet v4.0.1 mandatory requirements under acquirer pressure.
- Cardholder data spread across many systems
- v4.0.1 mandatory requirements (MFA, encryption, key management)
- Large, costly assessment scope
- Acquirer deadline pressure
Objectives
- Reduce PCI scope via tokenization and segmentation
- Meet v4.0.1 mandatory requirements
- Reach QSA-assessment readiness
- Produce acquirer-ready evidence
Our Approach
1. Scoping & Data Discovery
We found every place cardholder data lived and designed the target reduced environment.
2. Scope Reduction
Tokenization and network segmentation to shrink the assessed environment substantially.
3. v4.0.1 Remediation
MFA, encryption, key management and continuous evidence mapped to v4.0.1.
4. QSA Readiness
Evidence, SAQ/ROC preparation and acquirer-ready reporting with retest closure.
Solution
- Discovered every location of cardholder data and designed a reduced environment
- Applied tokenization and network segmentation to shrink assessed scope
- Implemented v4.0.1 mandatory controls (MFA, encryption, key management)
- Prepared SAQ/ROC evidence and acquirer-ready reporting with retest closure
Results
- ~60% reduction in assessed PCI scope
- v4.0.1 mandatory requirements met
- QSA-assessment readiness achieved
- Acquirer-ready evidence with retest closure
Timelines and outcomes reflect the documented engagement record for this client; results vary with scope and readiness.
What We Delivered
- Scope definition and network/data-flow diagrams for the cardholder data environment
- Gap assessment against PCI DSS v4.0.1 with risk-ranked remediation plan
- Evidence pack per requirement (configurations, records, sampled artefacts)
- Formal validation deliverable — Report on Compliance or Self-Assessment Questionnaire with Attestation of Compliance
- Quarterly ASV scan coordination and remediation verification
The standard artefact set for this engagement type; per-client environment and architecture details are shared under NDA during procurement, not published.
Lessons Learned
- Scope decided the budget: every environment that touched cardholder data unnecessarily was cost — segmentation work done early paid for itself before the assessment started.
- v4.0.1’s future-dated controls (MFA for all CDE access, payment-page script controls) were the schedule risk; treating them as day-one requirements removed the crunch.
- Evidence produced continuously beat evidence assembled before the audit — the requests that stall assessments are always for artefacts nobody collected at the time.
Talk to the team that ran this engagement
This was a real PCI DSS v4.0.1 QSA Assessment engagement. If you are preparing for the same, speak to a specialist who has delivered it — not a sales rep. We will give you a clear read on your scope, gaps and the fastest path, and reply within four business hours.
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