I still think you should be able to use Apple Pay without having a password set up on your iPhone. I prefer not to use a passcode for unlock. I don't see why it is set up this way, an unwanted user would still need your fingerprint to make a purchase, or your passcode to make any changes in settings.
Password? Have you even used Apple Pay?
Passcode to unlock? This is what the TouchID button is for. Do you even iPhone?
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Another thought I have always had... If Apple would just bite the bullet and keep their hand out of the cookie jar on things like Apple Pay, I feel like they would take off much more quickly and be more widespread. I think a lot of retailers chose not to go with Apple Pay because of Apple's cut of every transaction scared them off. I understand why they do it from a business perspective, but I feel like it could've been a bigger, more revolutionary thing.
The trivial fee paid to Apple covers the costs of administration and more importantly, raises a small barrier to entry ensuring card issuers are committed to supporting the program.
Or as Jim Rockford once said, "few folks appreciate something given to them for free."