When you filed your 2023 tax return you should have entered the amount you paid with the extension. If your total tax payments were greater than your total tax liabilities on your 2023 tax return you would have received a tax refund for the difference on the return.
Look at your form 1040 that was filed for 2023.
The federal extension payment will be shown on Schedule 3 Line 10. The amount from Schedule 3 Part II Line 15 flows to Form 1040 Line 31
The tax refund, if any, will be shown on Line 35a
