curl --request GET \
  --url https://api.siftstack.com/api/v2/users/{userId} \
  --header 'Authorization: Bearer <token>'

{
  "user": {
    "userId": "<string>",
    "userName": "<string>",
    "organizations": [
      {
        "organizationId": "<string>",
        "organizationName": "<string>"
      }
    ]
  }
}