When calling a REST services such as GET /services you will receive some data containing numerical values which have a semantic. Be it the Interface Direction or the Business Criticality.
If you want to find out the meaning of these fields you can use the cheat sheet provided below. Or you create a full export as a Workspace Administrator and you can find all used Types in the Worksheets in the Section Types.
By clicking on a Type Link (e.g. Interface Direction) you will be forwarded to the respective Worksheet in the Excel File. You will find these interpretation of the IDs in the second column.