curl --request POST \
  --url https://api.service.getjusto.com/v3/royalty/justo-coins/subtract \
  --header 'Content-Type: application/json' \
  --data '{
  "amount": 50,
  "userId": "u-001"
}'

{
  "success": true,
  "data": {
    "amount": -50,
    "websiteId": "w-001",
    "date": "2025-01-14T14:16:11.000Z",
    "balance": 200,
    "user": {
      "clientId": "rty-cli-001",
      "email": "cliente@example.com",
      "fullName": "Juan Pérez",
      "phone": "+1234567890"
    }
  }
}