I cannot find the document that details how refunds and payments were set up for the Tax year 2020 (though I see it for 2019). Where can I locate this information?

Yes. Your refund and payment information can be found on your Tax Return Summary.

1. Sign in to TurboTax.
2. Scroll down to Your tax returns & documents and select Show.
3. Under 2020, select Download/print return (PDF).
4. Open the PDF of your return. The first page is your Federal return summary.

The auto debit default date for federal and state payment is 4/15/2021.  You may check your bank two weeks after that date or call the IRS 1-800-829-1040.  To be sure, you may need to leave enough funds to cover the scheduled payments.