What is the best way to view Document Type, Subtype, and Classification hierarchy tree through the API?
To obtain a combination of internal names of Type, Subtype, and Classification that exist in a Vault. All Subtypes of a Type and all the Classifications of a Subtype need to be used.
If Type A has Subtype B and C.
and Subtype B has Classification D and E.
Similarly, Subtype C has Classification F and G.
Call all the combinations with the Retrieve Document Type/Subtype/Classification API Call:
Vault Retrieve Document Type API Documentation: Vault Help