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It doesn’t. Purchases need to be done through the audible web.

Even the amazon app doesn’t allow buying kindle ebooks directly.

Seriously? Why do Apple users tolerate this?

Apple is not opposed to payment systems that load money from a website into a platform like Spotify or Amazon. They are opposed to payment systems that bypass their Apple payment system from an app.

Doesn't Amazon have a better deal with Apple than pretty much anyone else?