public static void CreditOperation(this MT4Manager mt4, int login, double amount, int codePage, [Optional] string comment, [Optional] DateTime expiration)
{
var operation = new MT4CreditOperation()
{
Login = login,
Amount = amount,
Comment = comment,
Expiration = expiration == DateTime.MinValue ? mt4.ServerTime().AddMonths(50) : expiration
};
mt4.CreditOperation(operation, codePage);
}
