You can't buy books via Kindle Android app, but there are a few solutions
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How to Buy Kindle Books on iPhone & iPad (2023)
How to Buy Kindle Books on iPhone & iPad (2023)
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How to Buy Kindle Books on iPhone & iPad (2023)
How to Buy Kindle Books on iPhone & iPad (2023)
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Internal emails show how an Amazon ad prompted Steve Jobs and Phil Schiller to block in-app purchases of Kindle books on iOS - 9to5Mac
How to Buy Kindle Books on iPhone & iPad (2023)
