Also, many merchants now accept verbal authorizations via telephone and electronic authorization using the Internet, known as a cardnotpresent transaction (CNP).
当然，现在很多商家接受电话口头授权和网络电子授权，就是常说的离线交易（CNP）。
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The idea is that the CVV is a basic anti-fraud mechanism for so-called CardNotPresent transactions, which is why you are often asked for it when paying over the phone or online.