Pg Provider Exception
class PgProviderException : PortOneException, ApplyEscrowLogisticsException, CancelCashReceiptException, CancelPaymentException, CloseVirtualAccountException, ConfirmEscrowException, ConfirmIdentityVerificationException, DeleteBillingKeyException, IssueBillingKeyException, IssueCashReceiptException, ModifyEscrowLogisticsException, PayInstantlyException, PayWithBillingKeyException, RegisterStoreReceiptException, ResendIdentityVerificationException, SendIdentityVerificationException
PG사에서 오류를 전달한 경우