This answer will be for Federal taxes. States can have different payment methods.
If you have Federal taxes due and want to pay them outside of TurboTax, you can tell TurboTax you intend to pay the taxes by check. That does not obligate you to a check. You can then pay by any method you choose that the IRS allows.
You can pay Federal taxes owed for free at the IRS website below using "Direct Pay" which is a direct bank debit.
Or you can pay there with credit/debit card, but there is a service fee for that option. I see one of the companies the IRS shows there is the one you mentioned.
https://www.irs.gov/payments
