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Amazon Payments will not work with third party cookies turn off. PayPal actually works better than Amazon in that regards.

I've never had an issue with amazon payments (mostly through humble bundle) and I always have third party cookies turned off.

I tried disabling it around 2003 and had tons of problems with payment processors (using iFrames) and shared authentication schemes.

But after just researching it, it appears things may have improved. Apple made the default for Safari to block third party cookies, so if you want to be Mac/iPhone compatible you de-facto have to not break.

13 years ago?

Yes, some of us have been doing this for a long time.

I've had problems viewing "private" Vimeo videos with 3rd party cookies blocked