透支額度式
overdraw limit
係由發卡銀行依持卡人之申請而核予一定額度，在圈存於IC卡中，如有消費時，可以透支使用，但由發卡銀行計收透支利息，如憑卡融資即是。持卡人持卡消費，如果使用立即扣帳式支付消費金額時，已圈存額度優先扣帳，如有不足，在使用透支額度，再有不足時，則補收現金，以完成交易。
Department by the issuing banks for the cardholder to a certain amount by which nuclear, Quancun in the IC card and, if the consumer, you can use the overdraft, but by the issuing bank overdraft interest total income, such as ID card financing that is. Cardholders card spending, if used immediately debit payment amount of consumption, the amount has been Quancun debit priority, if insufficient, when using the overdraft limit, then there is inadequate, then up close cash to complete the transaction.