What is Payment Security Standards?

What Are Payment Security Standards?

Payment security standards are the formal rules and technical requirements that govern how organisations protect card payment data. They define what security controls must be in place, how systems must be configured, and how organisations must demonstrate that they are meeting these requirements. They are not suggestions or recommendations. They are mandatory for any organisation involved in processing, storing, or transmitting cardholder data.

The most prominent payment security standard is PCI DSS, the Payment Card Industry Data Security Standard. But PCI DSS is part of a broader ecosystem of standards that together create a strong security framework for the global payments industry.

The PCI Security Standards Family

The PCI Security Standards Council (PCI SSC) maintains several interconnected standards:

PCI DSS

The flagship standard. PCI DSS applies to any entity that stores, processes, or transmits cardholder data. It consists of 12 requirements covering network security, access controls, encryption, monitoring, and security policies. The current version is PCI DSS v4.0.

PA-DSS / PCI Software Security Framework

This standard applies to software vendors whose payment applications are sold to and used by merchants. It ensures that the software itself is designed and built securely. The older PA-DSS standard has been replaced by the PCI Software Security Framework, which includes the Secure Software Standard and the Secure Software Lifecycle Standard.

PCI PTS

The PIN Transaction Security standard covers the physical devices used to capture PINs and card data, such as point-of-sale terminals and PIN entry devices. It sets requirements for tamper resistance, encryption of PIN data, and device management.

PCI P2PE

Point-to-Point Encryption is a standard for encrypting card data from the point of capture (the terminal) all the way to the secure decryption environment. P2PE solutions can significantly reduce the scope of PCI DSS assessments because the encrypted data is considered unreadable and therefore out of scope.

Beyond PCI: Other Payment Security Standards

PCI standards are the most prominent, but they are not the only security frameworks relevant to payment processing:

• ISO 27001 is the international standard for information security management systems. While not payment-specific, many payment organisations use ISO 27001 as a foundation for their broader security programme
• SOC 2 (Service Organisation Control) provides a framework for assessing the security, availability, and confidentiality controls of service providers, including payment processors
• Strong Customer Authentication (SCA) requirements under PSD2/PSR set standards for authenticating payment transactions in the UK and EU
• National regulations such as the UK's Payment Services Regulations and the FCA's rules for payment institutions add regulatory requirements on top of industry standards

Why Payment Security Standards Matter for Businesses

These standards exist because the threats are real and the consequences of failure are severe. Data breaches in the payment industry have exposed millions of card numbers, costing billions in fraud losses and causing lasting reputational damage to the organisations involved.

For individual businesses, payment security standards provide a clear roadmap for protecting customer data. Without them, each organisation would be making its own judgments about what constitutes adequate security, and many would get it wrong. The standards establish a baseline that, when followed, significantly reduces the risk of a breach.

Compliance with payment security standards is also a contractual obligation. When a business signs a merchant agreement to accept card payments, they agree to comply with PCI DSS and other applicable standards. Failure to comply can result in fines, increased transaction fees, mandatory audits, and termination of the merchant account.

Payment Security Standards and Telephone Payments

Telephone payment environments are subject to the same payment security standards as any other channel. PCI DSS applies to every system that handles card data, including telephony infrastructure, agent workstations, and call recording platforms.

The challenge with telephone payments is that the card data flows through more systems than in a typical online transaction. The voice network, the agent's headset, the call recording system, and potentially the agent's screen all come into contact with card data. Each of these systems must meet the relevant security standards.

This is why descoping has become the preferred approach for telephone payments. By using technologies such as DTMF masking or payment links, businesses can ensure that card data never enters the telephony environment. This removes the phone system, the recording platform, and the agent workstations from the scope of PCI DSS, dramatically simplifying compliance.

Practical Considerations

• Start with scope. Before worrying about which controls to implement, identify exactly which systems handle card data. This defines your compliance scope
• Reduce scope where possible. Every system you can remove from card data handling is a system you do not need to secure, monitor, and audit
• Use validated solutions. PCI-listed P2PE solutions, PCI-validated payment applications, and PCI-certified service providers give you assurance that the technology meets the required standards
• Keep up with changes. Payment security standards are updated regularly. PCI DSS v4.0 introduced significant new requirements, and further updates will follow
• Compliance is continuous. Meeting the standard once is not enough. You must maintain compliance on an ongoing basis, with regular testing, monitoring, and review
• Get expert help if needed. Qualified Security Assessors (QSAs) and PCI Forensic Investigators (PFIs) can provide specialist guidance on meeting and maintaining compliance

Payment security standards are the foundation of trust in the card payment system. Businesses that take them seriously protect their customers, their reputation, and their ability to continue accepting card payments. Those that treat them as a checkbox exercise are taking a gamble they cannot afford to lose.