クレジットカード番号ってどうやって決まるの？ – ギズモード・ジャパン
ギズモード・ジャパン | クレジットカード番号ってどうやって決まるの？ ギズモード・ジャパン といっても、カード番号の最初の数字はカード会社によって決まっていて、VISAなら4、マスターカードなら5、アメックスなら34か37という具合です。でも、最初じゃなくて最後の1ケタがミソなんです。Data Geneticsによれば、これがあることでカード番号を書き込んだりコンピューター ... |
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