Yes, if your payment is not enough or the payment doesn't go thru, then you can pay your taxes owed on the IRS website.
https://www.irs.gov/payments
If you want to cancel your payment:
Call IRS e-file Payment Services 24/7 at 1-888-353-4537 to inquire about or cancel your payment, but please wait 7 to 10 days after your return was accepted before calling. Cancellation requests must be received no later than 11:59 p.m. ET two business days prior to the scheduled payment date.
