Q: What feature is required to send data from a web-connected device (like a point-of-sale system) to Google Analytics?
A) The Networking Protocol
B) Browser cookies
C) The Measurement Protocol
D) Data Import
Correct Answer is C) The Measurement 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