Startup Idea : Use Credit then auto Auto Debit

Pay for an item with a Credit Card and then that amount auto debits from your bank account after a certain amount of time to pay off the credit card amount. Example: I pay $50 for an item on Amazon.com with my Discover card. Once the purchase has processed, that $50 is auto withdrawn out of my bank account after 3 days to my Discover Card balance of $50. Successfully paying off my credit balance. This helps build credit but also helps to keep users out of debt.