Card cracking occurs when a scammer asks you for your checking account information or debit card and PIN. Then, scammers deposit fake checks, or counterfeit bills, and immediately withdraws the money, giving some of the cash to you.
Selling your ATM or Visa Debit Card and PIN is a crime. If a PIN is knowingly compromised, the account holder (not the "card buyer") is responsible for any wrongdoing in the account.