curl --request POST \
  --url https://backend.testeswaffle.org/referrals/login \
  --header 'Content-Type: application/json' \
  --data '{
    "email": "usuario@exemplo.com"
  }'

{
  "success": true,
  "data": {
    "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
    "user": {
      "user_id": "usr_123456789",
      "email": "usuario@exemplo.com",
      "referral_count": 5
    }
  }
}