curl --request GET \
  --url https://api.ledger.so/v1/users/{userId} \
  --header 'Api-Key: <api-key>'

{
  "object": "user",
  "id": "<string>",
  "firstName": "<string>",
  "lastName": "<string>",
  "email": "<string>",
  "applicationStatus": "notStarted",
  "createdAt": 123,
  "metadata": {}
}