IF you paid separately on the AZ website...you choose the mail a check option. That allows you to either mail a check, or pay on the AZ payment website.
But, you really shouldn't pay before you actually complete your AZ efile...and have it accepted (not just sent or transmitted) What happens if AZ rejects your e-file and the fix changes your balance due?
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____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*