one page checkout

Hi team,

I am using extension (https://wordpress.org/plugins/pmpro-aweber/) with this plugin.
Is it possible to have checkout and auto login when a customer fills the details, rather than multiple steps.
Currently, it lets users enter username, password and email, then sends them email for password reset, then they login and then the checkout comes.
Can it happen without all those page steps on the same page without requiring to login? If yes, which file to edit.

Thanks.

https://wordpress.org/plugins/paid-memberships-pro/