Why doesn't TurboTax support PayPal payments for Federal tax using ACI Payments Inc. or payUSAtax.com?

TurboTax does not suppor the use of PayPal to pay federal taxes through ACI Payments or payUSAtax.com. I have to use a work around where I select the payment by check option and then forward the payment receipt as proof of payment with the voucher. The two payment options are provide an interest free payment option with a nominal fee and should be supported with TurboTax.

P.S. I could find no option to submit a question in the Community section. I had to find a workaround on TurboTax.com through the automated chat function to get an option to submit a question.