How do prepaid debit cards work?

Answer 1

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Like a regular debit card. Like a paper check except it is plastic. Give an entity money, they give you the card, and when you present the card for a purchase, the seller gets the $ from the entity's bank account. 

Answer 2

You pay for the card and how much you pay determines how much money you can spend. You then use it like any debit card until your balance is $0.