美國運通卡的4位數識別碼 - 信用卡
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By Erin
at 2018-07-26T20:01
at 2018-07-26T20:01
Table of Contents
美國運通卡卡號右上方有4位數的識別碼
在網上刷卡時須填入驗證
我的識別碼是8197
但剛在刷卡時誤輸入成8194卻驗證成功
再試8199、8198、8187都驗證成功
輸入7918驗證失敗
有人知道運通卡這個4碼驗證是什麼機制嗎
感覺有點獵奇XD
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信用卡
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By Ingrid
at 2018-07-27T00:26
at 2018-07-27T00:26
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By Victoria
at 2018-07-29T12:54
at 2018-07-29T12:54
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