Here’s the ADMIN WildApricot API JSON from Postman. You can import this URL into your Postman account.
The authorization has variable values which you can setup in an environment or just overwrite them with the known URLs and client ID and client secret keys
Note you will have to put an authorized URI into the WIldApricot authorized apps section:
https://www.getpostman.com/oauth2/callback
There is another post on [using Postman]Check out these useful API discovery resources - #11 by alex.newpath) here I believe.