# Glossary
source: https://developer.mastercard.com/mastercard-checkout-solutions/documentation/glossary/index.md

This page contains an alphabetical list of words that you may come across when exploring the Mastercard Checkout Solutions documentation.

| Abbreviation |                                                                                                                                                                                                            Description                                                                                                                                                                                                             |
|--------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| API          | Application Programming Interface.                                                                                                                                                                                                                                                                                                                                                                                                 |
| BIN          | Bank Identification Number (BIN) -- A BIN or issuer identification number (IIN) is a six-digit number assigned in association with an ICA number and typically used to identify an issuing or acquiring portfolio for transaction authorization and clearing purposes.                                                                                                                                                             |
| CEK          | Content Encryption Key. Is an AES symmetric key to be used for encryption.                                                                                                                                                                                                                                                                                                                                                         |
| CSS          | Cascading Style Sheet. A standard for adding text styles to webpages.                                                                                                                                                                                                                                                                                                                                                              |
| CTA          | Call to action.                                                                                                                                                                                                                                                                                                                                                                                                                    |
| CVC2         | Card Validation Code 2, for Mastercard, are values that are used as a security feature for verifying your credit card while making "card not present" transactions. These 3 or 4-digit values are generated randomly when the credit card is issued.                                                                                                                                                                               |
| DPA          | Digital Payment Application. A website, web or mobile application operated by the merchant, marketplace, or other service provider where consumer can purchase goods or services                                                                                                                                                                                                                                                   |
| DCF          | Digital Card Facilitator is a network centric component that provides the cardholder core functionality including identity enrollment, address management, device management and checkout. It provides a consumer with access to a digital card and selected payment card information, collects additional details as required such as consumer ID, address and cardholder authentication.                                         |
| DSRP         | Digital Secure Remote Payment. [Read more](https://developer.mastercard.com/mastercard-checkout-solutions/tutorial/integrate_apis/step8/index.md)                                                                                                                                                                                                                                                                                  |
| DTVC         | Dynamic Token Verification Code (dynamic one time CVC2 generated for a token)                                                                                                                                                                                                                                                                                                                                                      |
| ECI          | Electronic Commerce Indicator                                                                                                                                                                                                                                                                                                                                                                                                      |
| EMV          | EMV® is a global standard for credit and debit payment cards based on chip card technology. EMV chip-based payment cards, also known as smart cards, contain an embedded microprocessor, a type of small computer. The microprocessor chip contains the information needed to use the card for payment, and is protected by various security features. [Read More](https://www.emvco.com/emv-technologies/secure-remote-commerce/) |
| FPAN         | (Funding) Primary Account Number.                                                                                                                                                                                                                                                                                                                                                                                                  |
| ISO          | International Organization for Standardization. Also used in references to their standards.                                                                                                                                                                                                                                                                                                                                        |
| JS           | JavaScript                                                                                                                                                                                                                                                                                                                                                                                                                         |
| JSON         | JavaScript Object Notation. Open standard file format and data interchange format.                                                                                                                                                                                                                                                                                                                                                 |
| JWE          | JSON Web Encryption (JWE) is an encryption format for JSON.                                                                                                                                                                                                                                                                                                                                                                        |
| JWS          | JSON Web Signature (JWS) is a signature format for JSON.                                                                                                                                                                                                                                                                                                                                                                           |
| JWT          | JSON Web Token.                                                                                                                                                                                                                                                                                                                                                                                                                    |
| MFA          | Multi Factor Authentication.                                                                                                                                                                                                                                                                                                                                                                                                       |
| OTP          | One Time Password is a password that is valid for only one login session or transaction. For Mastercard this will be sent via SMS or Email.                                                                                                                                                                                                                                                                                        |
| RSA          | Public-key cryptography system.                                                                                                                                                                                                                                                                                                                                                                                                    |
| PSP          | Payment Service Provider. A payment service provider (PSP) is a third-party company that assists businesses to accept electronic payments, such as credit cards and debit cards payments. PSPs act as intermediaries between those who make payments, i.e. consumers, and those who accept them, i.e. merchants.                                                                                                                   |
| UUID         | Universally Unique Identifier.                                                                                                                                                                                                                                                                                                                                                                                                     |
| TAF          | Token Authentication Framework. A Mastercard framework to define authentication methods for tokenized transactions.                                                                                                                                                                                                                                                                                                                |
| TAS          | Token Authentication Service. A Mastercard service to offer transaction authentication during checkouts. [Read more](https://developer.mastercard.com/mastercard-checkout-solutions/documentation/token-authentication/index.md)                                                                                                                                                                                                   |
| 3DS          | Three Domain Secure. An e-commerce authentication protocol that enables the secure processing of payment, non-payment and account confirmation card transactions.                                                                                                                                                                                                                                                                  |