Your only proof of payment is your bank statement or credit card showing the payment coming out. Turbo Tax only passes your bank account number to the IRS to take it out of your account. Some banks use different routing numbers for deposits and payments. Double check the number you entered with your bank.
If your extension payment didn't go through or get paid, be sure it doesn't automatically show up on your return! You may need to delete it. See this Extension FAQ for how to get there. Then you can change to amount to zero.
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