{
    "user.not_found": {
        "code": 100002,
        "message": "User not found"
    },
    "user.login_success": {
        "code": 0,
        "message": "Login successful"
    },
    "user.welcome": {
        "code": 0,
        "message": "Welcome, %s"
    },
    "user.logout": {
        "code": 0,
        "message": "Logout"
    },
    "error.invalid_params": {
        "code": 100001,
        "message": "Invalid parameters"
    },
    "error.server_error": {
        "code": 100003,
        "message": "Server error"
    },
    "order.created": {
        "code": 0,
        "message": "Order created successfully"
    },
    "order.paid": {
        "code": 0,
        "message": "Order paid successfully"
    },
    "message.count": {
        "code": 0,
        "message": "You have %d new messages"
    }
}