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Custom ROMs have had just about enough of being Android's second-class citizens
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
the app hides the real numbers for the credit card and gives the POS a mock id to make the purchase. it's harder to clone. also you need to unlock the phone for it to work it's an extra layer of protection
Giving a mock card sounds useful. I've looked into that for paying online but I couldn't find an open source way to do it.
Pretty sure all contactless forms of payment work like that