If your return was accepted, you cannot change your payment method or payment date. But you can cancel the payment and then pay with a different payment method. You can then make your payment here: Paying Your Taxes
Please see the following IRS link for contact information and details:
IRS Pay Taxes by Electronic Funds Withdrawal - Internal ... under the heading- Cancellations, Errors and Questions for details.
For additional information, please see the following link: When will my tax payment go through?
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