We would like to add a custom reference associated with each sale, for link the sale to our customers, is it possible? And if it's possible, how can we do it?
Thank you for contacting us.
What you can do is sending a thirdPartyReference with the customer, this is a unique reference for this consumer which can help to identify him later on.
More details here https://redoc.lsk.lightspeed.app/#operation/placeLocalOrder
I hope this helps.