What happens if someone overdrafts a Walmart prepaid debit card using it as a backup funding source for online Paypal purchases? The prepaid card would be the "bank account" used to verify the Paypal, since they come with a checking account #. So say the Paypal account has $0 balance on it, the Walmart card/"bank account" has $10 balance on it, but someone spends $600 at Newegg and gets next-day shipping? The person in this scenario is not me nor is in any way related to me. This is a what-if scenario.