If your business accepts credit or debit cards—whether at a checkout counter, through an online store, or over the phone—you need to follow PCI DSS (Payment Card Industry Data Security Standard). It’s a set of security rules created by Visa, Mastercard, and the other card companies to protect customer payment data.
It applies to every business that handles card information, no matter how small. The good news is that for most Ontario SMBs, compliance is simpler than you think.
What you actually need to do (simplified)
PCI DSS has 12 requirements, but for a small business the most important ones come down to these five areas:
1. Use a firewall & secure your network
Make sure your business internet is behind a proper firewall. Don't connect your payment terminal to the same Wi-Fi as customer internet. Change default passwords on routers, printers, and POS systems.
2. Encrypt card data & don't store it
Use TLS 1.2 or higher for any website that takes payments. Better yet: don't store credit card numbers. Use a payment processor like Moneris, Square, or Stripe that handles the card data so it never touches your systems.
3. Protect every computer with anti-malware & EDR
Every laptop, desktop, and server that touches the payment process must have anti-malware or EDR installed. This is one of the most common requirements—and one of the most commonly missed.
4. Use strong passwords & multi-factor authentication (MFA)
Every user login to a system that connects to payment data needs a strong password. Since March 2025, MFA is required for all access to these systems—not just remote access.
5. Scan for vulnerabilities quarterly
Your payment processor requires you to run external vulnerability scans every 3 months (done by an Approved Scanning Vendor). Internal scans of your own systems are also required quarterly.
What happens if you don't comply?
The PCI Council doesn't fine you directly—your bank does. Consequences include:
- Monthly fees of $20–$50 until you file your compliance form
- Hefty fines if breached — $25–$150 per card number stolen (up to $500,000 per breach)
- Forced investigation costs — $15,000–$100,000 for a forensic audit after a breach
- Loss of ability to process cards — if your bank drops you, getting a new merchant account is very difficult
How ByteBarrier’s current services help
You’re likely already using or considering ByteBarrier for endpoint protection (EDR) and vulnerability scanning. These two services directly cover the most important PCI DSS requirements:
- EDR / Endpoint Protection Covers PCI Requirement 5 (anti-malware on all systems in scope). Every laptop, desktop, and server gets 24/7 threat monitoring, automatic malware detection, and rapid response—exactly what PCI auditors look for.
- External ASV scanning Covers PCI Requirement 11.3. ByteBarrier runs quarterly external scans through approved vendors and quarterly internal scans of your network. We track and help fix any issues found.
- Patch management Covers PCI Requirement 6 (secure systems). Keeping software updated is a core PCI requirement. We identify missing patches, prioritise them by risk, and verify they're applied.
- Log monitoring & retention Covers PCI Requirement 10. We collect logs from your systems, keep them for 12+ months, and review them daily for security events—matching the 2025 PCI requirements.
- Security policies & incident response Covers PCI Requirement 12. We help you create the information security policy and incident response plan that PCI auditors ask for, with annual testing to stay current.
The bottom line: The two services you likely already need—EDR and vulnerability scanning—cover half of what PCI DSS requires. Add MFA deployment and basic log retention, and you're most of the way there.
Wondering if you're PCI compliant?
ByteBarrier is here to help as your trusted security partner. We help
Ontario businesses meet PCI DSS requirements through managed EDR,
vulnerability scanning, and security operations. Contact us today
for a free 30-minute PCI check-up—we'll tell you exactly where
you stand and what you need to fix.
Official source: PCI Security Standards Council →. Information current as of July 2026. Check with your payment processor for your specific SAQ and requirements.