Want alternative for credit card??

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what if we get alternative for credit cards??? i mean no cards but our finger prints work as our identity...we get small seperate device kinda mouse or card reader or webcam which can scan our finger prints and we can be granted access in our accounts in banks when finger prints are matched... same in ATMs ..so no need to take cards with us.. favourable points: 1) cards can be stolen 2) card number can be read 3) finger prints are always with us no matter how bad our memory is and no need of passwords