Developers that do not communicate directly with the Olo APIs can ignore this
field.The field is only present for merchants that have integrated with Olo. This
UID should be used instead of the Reward ID when attempting to apply a reward
to the basket when communicating directly with the Olo API.This UID can also be used to match records (via the externalreference Olo
rewards API attribute) being returned by the Olo API to relevant reward or
points product records in the Thanx API.