If I pay the amount due on my extension for US IRS form 4868 through an IRS approved payment provider that accepts credit cards such as PayUSAtax.com who charge 1.87% for the service and I designate the payment is for form 4868 extension, does the payment and confirmation code I receive constitute everything needed or must I file the form 4868 somehow?
The IRS instructions state in part about credit card payments for individuals:
Form 4868, Application for Automatic Extension of Time to File U.S. Individual Income Tax Return (current year). E-pay by phone or Internet through a service provider and receive an extension of time to file.
The form's instructions state in part:
Making Payments Electronically For information on paying your taxes electronically by using EFTPS or with a credit or debit card, go to www.irs.gov/e-pay. You must enroll in EFTPS before you can use it. Go to www.eftps.gov for details. Confirmation number. You will receive a confirmation number when you pay online or by phone. Enter the confirmation number below and keep for your records. Enter confirmation number here ▶ Note. Do not file a paper Form 4868 if you already submitted it electronically and are not mailing in a payment.
This all seems to imply that the payment constitutes an extension however it talks about submitting the form electronically which I did not do, I only made payment for the form. Should form 4868 somehow still be submitted my paper or electronically or am I done with the extension process?