Once ASA has signed into ORMPOS, regular HTTP requests are required to keep the ORMPOS server session from timing out and logging out the user. To keep the session alive, ASA makes regular, lightweight polling calls to the ORMPOS, using the API getSaleTransaction. This polling interval is configurable in the settings plist, using this key:

POS_REST_POLL_GETSALETRANSACTION_INTERVAL_MINUTES

and is set in minutes. The default is set to poll every 10 minutes, and invokes the getSaleTransaction API. The getSaleTransaction API requires a HTTP GET request and the path specifies the Store Id and Register Id.