Error handling

{
  "error": "ValidationError",
  "message": "Invalid request parameters",
  "statusCode": 400,
  "details": [
    {
      "field": "email",
      "message": "Invalid email format",
      "value": "invalid-email"
    },
    {
      "field": "amount",
      "message": "Amount must be greater than 0",
      "value": -100
    }
  ],
  "requestId": "req_1234567890abcdef"
}