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My understanding (I was interested in the same sort of thing) is that there is no event fired when an NFC tag is removed. So the only way to do this would be a check at regular intervals to see if the NFC tag is still connected, and I'm not sure that even that is possible.


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Most card's chips are readable via the NFC sensor in your phone. There are quite a few apps on the play store that allow you to read card info (ex BankCard Reader). If you are capable of writing your own application you may be able to receive payments via an external API.



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