Building a FinTech application means navigating complex security and compliance requirements. This guide covers PCI DSS, SOC 2, GDPR, and security best practices.
Understanding FinTech Compliance
FinTech companies must comply with multiple frameworks: PCI DSS for payment cards, SOC 2 for service organizations, GDPR for EU customers, and various local regulations.
PCI DSS Compliance
The 12 Requirements
Payment Card Industry Data Security Standard includes 12 requirements for protecting cardholder data, from firewall configuration to information security policy.
Reducing PCI Scope
Best strategy: use tokenization and hosted payment pages. Use services like Stripe or PayPal to handle card data, reducing your compliance burden.
Implementation Checklist
- Never store CVV/CVC codes
- Encrypt data at rest (AES-256)
- Use TLS 1.2+ for data in transit
- Implement strong access controls
- Regular vulnerability scans and penetration testing
SOC 2 Compliance
Five Trust Service Criteria
Security, availability, processing integrity, confidentiality, and privacy. SOC 2 Type II demonstrates controls operate effectively over 6-12 months.
Key Controls
- Access management with RBAC and MFA
- Change management procedures
- Incident response plan
- Business continuity and disaster recovery
- Vendor management program
GDPR Compliance
Core Principles
Lawfulness, purpose limitation, data minimization, accuracy, storage limitation, integrity, and accountability.
User Rights
Right to access, rectification, erasure, data portability, restrict processing, and object to processing.
Technical Measures
- Encryption at rest and in transit
- Pseudonymization and anonymization
- Access controls and audit logs
- 72-hour breach notification requirement
Payment Security Best Practices
Strong Customer Authentication
Implement two-factor authentication for payments. Required in Europe under PSD2.
Fraud Detection
Use machine learning for anomaly detection, velocity checks, geolocation verification, and device fingerprinting.
API Security
- OAuth 2.0 for authorization
- JWT tokens with short expiration
- Rate limiting and IP whitelisting
- HMAC signatures for request validation
Anti-Money Laundering
KYC Requirements
Verify customer identity through document verification, liveness detection, address verification, and sanctions screening. Use services like Onfido or Jumio.
Transaction Monitoring
Monitor for unusual patterns, high-risk jurisdictions, structuring, and rapid fund movement.
Security Architecture
Implement defense in depth with multiple security layers: perimeter (WAF, DDoS), network (VPC, security groups), application (input validation), data (encryption), and identity (MFA, RBAC).
Incident Response
Have a plan: preparation, detection, containment, eradication, recovery, and lessons learned. Document everything and notify authorities within required timeframes.
Cost of Non-Compliance
GDPR fines up to €20M or 4% of revenue. PCI DSS fines $5,000-$100,000 per month. Plus reputational damage and customer trust loss.
Conclusion
FinTech security and compliance is complex but achievable. Start early, use automation, and make security part of your culture.
Need help with FinTech compliance? Our team has extensive experience with PCI DSS, SOC 2, and GDPR. Contact us.
How Direlli can help
Direlli builds secure, compliant FinTech software with ISO 27001-aligned practices. Explore our FinTech development and custom software, or get a free consultation. Direlli is rated 5.0 on Clutch and serves clients across the US, Europe and MENA.
