curl --request POST \
  --url https://api.cargado.com/users/updateByEmail \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --data '
{
  "users": [
    {
      "email": "<string>",
      "externalId": "<string>"
    }
  ]
}
'

{
  "results": [
    {
      "status": "MATCHED",
      "email": "<string>",
      "id": "<string>",
      "externalId": "<string>"
    }
  ]
}