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Wowbeing 我不知道你是真的用过 Apple Pay 在美国商店里交过钱还是只是读过网上的报道， Apple Pay 刷卡额度较大的时候，很多店的 POS 机的确是要求签字的（在显示屏上用触控笔签不是签在小票上），之前在 Best Buy 买 iPad 的时候记得就签字了，超市如果买的比较多也要签字。这个触发机制和商家以及信用卡运营商的防盗刷监控有关系，并没有一条明确的分界线。
"Depending on the retailer, the card you ’ re using, and the value of your purchase, you might need to enter your PIN or provide a signature to complete the transaction."
来源：
http://www.macworld.com/article/2834669/the-ultimate-guide-on-how-and-where-to-use-apple-pay.html“ wondered about that, so I asked my own credit card issuers about their policies. What I found is that, in my two cases, 1) there is no fixed dollar amount that dictates when I have to sign and 2) there is a very sophisticated, tiered fraud prevention system, from the credit card corporate level, then down to the issuing bank, and finally the merchant that may dictate when I have to also sign.”
来源：
http://www.imore.com/when-does-apple-pay-require-signature当然这个和题目没什么关系，刷个卡而已，再争论下去也没什么意义了