What is Mastercard?

What Is Mastercard?

Mastercard Incorporated is a global payment technology company that operates one of the world's largest electronic payment networks. Like Visa, Mastercard does not issue cards itself -- it provides the network infrastructure that connects cardholders, merchants, issuing banks, and acquiring banks to facilitate secure, fast card transactions worldwide.

Mastercard processes billions of transactions each year across more than 210 countries and territories. In the UK, Mastercard is the second-largest card network after Visa, with its cards issued by most major banks and building societies for both consumer and business use.

How the Mastercard Network Works

Mastercard's global network -- known as Banknet -- processes transactions through the same three-stage flow used by all major card networks:

• Authorisation: The merchant's payment gateway sends the transaction to Banknet, which routes it to the cardholder's bank. The bank checks the card details, available balance or credit, and fraud indicators, then returns an approval or decline in approximately 1-2 seconds
• Clearing: Mastercard facilitates the exchange of transaction details between the issuing and acquiring banks, confirming the final amount after any adjustments (such as tips or currency conversion)
• Settlement: Net amounts are calculated and funds are transferred between banks. The merchant receives the payment (minus fees) and the cardholder's account is debited

Banknet can process more than 5,000 transactions per second and provides the reliability that merchants and cardholders depend on for everyday payments.

Mastercard Card Types

Mastercard Debit

Debit cards on the Mastercard network are linked to the cardholder's bank account. Payments are deducted directly from the available balance. In the UK, Mastercard Debit is widely issued by banks and challenger banks alike.

Mastercard Credit

Credit cards on the Mastercard network provide a revolving credit facility. Cardholders can spend up to their credit limit and repay monthly, with interest charged on outstanding balances.

Mastercard Prepaid

Prepaid Mastercard cards are loaded with funds in advance and not linked to a bank account. They are popular for travel, budgeting, and situations where a traditional bank account is unavailable.

Mastercard Commercial

Business cards, corporate cards, and purchasing cards designed for company spending. These include expense management features, reporting tools, and customisable spending limits.

Mastercard Security Features

Mastercard has developed a thorough suite of security technologies:

• Mastercard Identity Check Mastercard's implementation of 3D Secure 2 / SCA for online payments. It uses biometrics, one-time passcodes, and risk-based analysis to authenticate cardholders
• CVC2 The three-digit security code (Mastercard uses the term CVC) on the back of the card, used for card not present verification
• Mastercard Digital Enablement Service (MDES) Tokenisation technology that replaces card numbers with unique tokens for digital wallets and online payments
• Decision Intelligence AI-powered real-time fraud detection that analyses transaction patterns, location data, device information, and hundreds of other signals to identify suspicious activity
• EMV chip: Chip-and-PIN technology for secure in-person payments
• Mastercard Cyber Secure A programme that helps banks and merchants identify and assess cyber risk across their digital ecosystems

Mastercard's Role in PCI DSS

Mastercard is a founding member of the PCI Security Standards Council and operates its own compliance programme -- the Mastercard Site Data Protection (SDP) programme. This programme defines:

• Transaction volume thresholds for merchant and service provider levels
• Compliance validation requirements for each level
• Penalties for non-compliance and data breaches
• Registration requirements for service providers

Mastercard's SDP requirements are broadly aligned with Visa's CISP programme, and in practice, PCI DSS compliance satisfies both. However, Mastercard has its own chargeback monitoring programme (the Excessive Chargeback Programme) with specific thresholds and penalties that merchants must be aware of. Mastercard defines an excessive chargeback merchant as one with more than 100 chargebacks and a chargeback ratio above 1.5% in a given month.

Mastercard and Telephone Payments

Mastercard cards are frequently used for telephone payments across the UK. Like all card brands, Mastercard classifies telephone payments as MOTO (Mail Order / Telephone Order) transactions. Key characteristics include:

• MOTO transactions are exempt from Strong Customer Authentication
• Mastercard Identity Check (3DS2) does not apply to MOTO transactions
• The merchant bears full liability for fraud-related chargebacks
• CVC2 verification is the primary security check for telephone payments
• Interchange rates for MOTO may differ from e-commerce or point-of-sale rates

Mastercard requires all merchants to protect cardholder data in accordance with PCI DSS, and this applies fully to telephone payment environments. Contact centres processing Mastercard payments must ensure that card data is secured throughout the call -- from the moment it is captured to the point of authorisation -- and that no card data is stored in call recordings, agent notes, or any other system after the transaction is complete.

Mastercard vs Visa

From a cardholder's day-to-day perspective, Mastercard and Visa function almost identically. Both are accepted at the same merchants, both process transactions in seconds, and both offer similar security features. The main differences are:

• Interchange rates Rates can vary between the two networks for specific transaction types and merchant categories
• Cardholder benefits Premium cards on each network may offer different travel insurance, purchase protection, or reward programmes (set by the issuing bank, not the network itself)
• Processing technology Both networks are highly reliable, with slightly different architectures (VisaNet vs Banknet)

For merchants, accepting both Visa and Mastercard is standard practice in the UK -- refusing either would mean turning away a significant proportion of potential customers.