Get details about an user by external ID

curl --request GET \
  --url https://api.example.com/api/partners/v2.0/org/{org_id}/users/by-ext-id/{external_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organization_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "email": "<string>",
  "num_inverters": 123,
  "num_heat_pumps": 123,
  "num_electric_vehicles": 123,
  "num_wallboxes": 123,
  "external_user_id": "<string>",
  "first_name": "<string>",
  "last_name": "<string>",
  "is_onboarded": true,
  "street_and_number": "<string>",
  "street_add_info": "<string>",
  "zip_code": "<string>",
  "town": "<string>",
  "country": "<string>",
  "latitude": 123,
  "longitude": 123,
  "last_login": "2023-11-07T05:31:56Z",
  "joined_at": "2023-11-07T05:31:56Z"
}