# Glossary
source: https://developer.mastercard.com/payment-account-management/documentation/glossary/index.md

|   Terms   |                                                                Definition                                                                |
|-----------|------------------------------------------------------------------------------------------------------------------------------------------|
| *ABU*     | Account Billing Updater                                                                                                                  |
| *API*     | Application Programming Interface                                                                                                        |
| *Array*   | Data structure consisting of a collection of similar elements (values or variables), each identified by at least one array index or key. |
| *BIN*     | Bank Identification Number                                                                                                               |
| *Boolean* | Data type with only two possible states: true or false                                                                                   |
| *Client*  | Client application consuming the PAM API                                                                                                 |
| *HTTP*    | Hypertext Application Language                                                                                                           |
| *JSON*    | JavaScript Object Notation                                                                                                               |
| *MDES*    | Mastercard Digital Enablement Service                                                                                                    |
| *MTF*     | Mastercard Test Facility                                                                                                                 |
| *OAuth*   | Open protocol to allow secure authorization in a simple and standard method from web, mobile, and desktop applications                   |
| *PAM*     | Payment Account Management                                                                                                               |
| *PAN*     | Primary Account Number                                                                                                                   |
| *PAR*     | Payment Account Reference                                                                                                                |
| *PCI*     | Payment Card Industry                                                                                                                    |
| *REST*    | Representative State Transfer                                                                                                            |
| *RSA*     | A public-key cryptosystem that is widely used for secure data transmission                                                               |
| *Token*   | Alternative value for the primary account number (PAN) used by a payment card issuer to identify a payment card account                  |
| *URL*     | Uniform Resource Locator                                                                                                                 |