ApplePay signed up 3 million cards in the first week

Hearing that #ApplePay has now signed up 3M cards. (Last night Tim said 1M in first 72 hrs.) Not bad at all, @Apple.
— Amir Efrati (@amir) October 28, 2014

Note - Amir Efrati is a reporter at The Information
Note - 3m cards doesn't mean 3m people - you can upload multiple cards and choose which to pay with (as far as I know)