> For the complete documentation index, see [llms.txt](https://docs.pagopa.it/centrostella-1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pagopa.it/centrostella-1/glossary.md).

# Glossary

<table><thead><tr><th width="288.5"></th><th></th></tr></thead><tbody><tr><td>Terms, Acronyms, and Abbreviations</td><td>Definition</td></tr><tr><td>Acquirer</td><td>Payment institution or bank that offers its services to merchants, by installing physical POS or in any case by intermediating payment transactions</td></tr><tr><td>App IO</td><td></td></tr><tr><td>POS</td><td>Point of Sale</td></tr><tr><td>RTD</td><td>Digital Transaction Register</td></tr></tbody></table>