I wonder what are the difference between L series and K series ?
How do I know which version I am using ?
Lightspeed L Series and K Series are effectively two different platforms.
The L-Series documentation can be found here: https://resto-support.lightspeedhq.com/hc/en-us
The K-Series documentation can be found here: https://ikentoo.screenstepslive.com/s/en