As long as the pay station is open. Otherwise you put cash in an envelope and put it in the slot.
Take cash in case park staff is unavailable ...
If the ranger station/entry station is open, yes, you can use credit card. If you arrive outside of working hours, you'll need cash
I use the mail slot but I also go in a different entrance. I go off of hunt hwy Wagon Wheel way and it does have off stream parking but there are signs that are in places that state don't park here... This side will start you out dynamite trail and San tan trail.
Only if someone is working the window. Otherwise its cash into a little mail slot in the envelope they provide
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