How do i use dumps to turn them into cash

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Hey ive got swiping down for food, 50/50 for gas and like 20% for in store purchases in which honestly is probably my fault for choosing the wrong dumps but my major question is what's the best method to use dumps and make real cash with them. I've heard about using a pin at the atm or simply just buying things and returning them for cash but the most i have ever swiped in one go is $160. So my real question is what's the true potential of a dump and the best method to make real cash off of dumps