I have seen several clips of magicians/mentalists reveal credit card pin codes, however I haven't seen much discussion on this or published tricks. There are some published tricks for pin codes for phones, but the ones I have seen dont transfer to credit cards. It would appear with some of the performances with credit card pin reveals that they make use of actual body language reading. Do anyone have experience with these things or are aware of resources relevant? Very exciting topic - 'reading' people without all sorts of props