Taking the safe strategy of the financial magnetic stripe card for an example, we discussed various safe calculating ways and strategies in the application of the actual card business.

以金融磁条卡的安全策略为例，讨论了多种安全算法与策略在实际卡业务中的应用。

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To be sure, calculating the financial impact is difficult because few card companies disclose how much revenue is derived from imposing fees and other penalties on customers who fall behind on their bills.

WSJ: Card Issuers Gird for Cut to Late Fees