All endpoints speak JSON. A Content-Type header with value application/json is expected to always be present.
The base url is https://api.sentiance.com/<version>/ for all REST endpoints, where the currently supported versions are v2 and v3. v1 has been fully deprecated. Note that not all APIs are common between v2 and v3 versions.
Note: The user deletion API is the only exception to the versioned endpoints rule. It stands on its own as DELETE /users/:user_id