How to manually enter ach info for final payment

I'm in a predicament. Picking up my new car in 16 hours but the app didn't show the option to pay until the past hour or so. I'm trying to bypass plaid and enter ach manually bc I don't want to use plaid. Got to the page that says exit to enter manually but when I exit it takes me back to the same payment page. I was able to do this for my wallet but unable to do this for the final payment. Did they catch on to this trick and disabled it? Since it's the weekend, I can't wire or get a cashier's check so will have to reschedule pick up if I can't get this done.