| Word | Description |
| Payment Processing | Another phrase for transaction processing. |
| Perl | Practical Extraction and Report Language. A popular programming language used for web server applications. It can be used for creating interactive forms and CGI programs. E-xact has a Perl Module Transaction Component for Unix/Linux systems. |
| Point of Sale | This is the point at which a product is paid for. Merchant Sales are conducted by credit card swipe terminal. On the Internet, this is the software that enables the merchant to accept transactions on their online store. |
| POS | This is the point at which a product is paid for. Merchant Sales are conducted by credit card swipe terminal. On the Internet, this is the software that enables the merchant to accept transactions on their online store. |
| Pre-authorization | The method by which an amount of funds is reserved for a period of time to await sales completion. |
| Python | A general-purpose, high-level programming language. Its design philosophy emphasizes programmer productivity and code readability. |