If you still remember your password for autopay.io, then you can still log in with the email even though you do not have access to the email itself anymore. Once you are logged in, you can go to your profile and change the email address there and log in with this email in the future. This way you do not have to worry about forgetting the password for autopay.io and not being able to reset it.
If you cannot remember your password anymore, then you cannot reset your password either because the reset link will be sent to your email. In this case you can contact us by sending us the email to firstname.lastname@example.org so that we can delete the existing profile, and you will be able to make a new profile with an existing email.