=> (require '[vault.core :as vault])

=> (def client (vault/new-client "https://vault.example.com"))

=> client
#vault.client.http.HTTPClient
{:api-url "https://vault.example.com",
 :auth #<Atom@5cca1513 nil>
 :lease-timer nil
 :leases #<Atom@640b3e30 {}>}

=> (vault/authenticate! client :app-id {:app "my_app", :user "0000-userid-000"})
; INFO: Successfully authenticated to Vault app-id my_app for policies: my-policy
#vault.client.HTTPClient
{:api-url "https://vault.example.com",
 :auth #<Atom@5cca1513 {:client-token "8c807a17-7232-4c48-d7a6-c6a7f76bcccc"}>
 :lease-timer nil
 :leases #<Atom@640b3e30 {}>}

=> (vault/read-secret client "secret/foo/bar")
{:data "baz qux"}