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