curl --request GET \
  --url https://api.shiftkeeper.io/users/{user_id} \
  --header 'x-api-key: <api-key>'

{
  "user": {
    "id": "<string>",
    "name": "<string>",
    "email": "[email protected]",
    "role": "owner",
    "seat": "viewer",
    "time_zone": "<string>",
    "slack_id": "<string>"
  }
}