example.cs

public bool CanBuyMouse(User _user)
{
      if (_user.Level > 13)
        {   // Require approval
            return ApprovalSystem.Approve(_user, producttype: mouse)
        }
      else if(_user.Level.Between(12,3))
      {   // Below €50,- month
          return _user.expenses < 50.00;
      }
      else 
      {   // Below €5000,- month
          return _user.expenses < 5000.00;
      }
}