What feature is required to send data from a web-connected device (like a point-of-sale system) to Google Analytics?
- Data Import
- The Measurement Protocol
- Browser cookies
- The Networking Protocol
The Measurement Protocol lets you send data to Analytics from any internet-connected device. It’s particularly useful when you want to send data to Analytics from a kiosk, a point of sale system, or anything that is not a website or mobile app
Read more here: https://support.google.com/analytics/answer/6086079