Voucher or Not to Voucher that is the Question

I set up the form 9465 to establish a payment plan that will be taken directly out of my checking account.  If this has been approved, do I still need to mail the printed voucher?   Doesn't seem logical that I would send them funds when they are authorized by me to take them directly from my checking account.   Please advise.
Kbaker69 / Mesa, AZ