curl --location --request GET '/rest/api/3/project//classification-level/default'
{"classification":{"id":"ari:cloud:platform::classification-tag/5bfa70f7-4af1-44f5-9e12-1ce185f15a38","status":"published","name":"Restricted","rank":1,"description":"Data we hold that would be very damaging and would cause loss of trust with customers and present legal risk if mishandled","guideline":"Access to data must be restricted to only individuals who need access in order to perform their job duties.","color":"RED"}}