Restricted access question

I’m new to WP and have installed pippingsplugin for Restricted Content.

My questions is this: as I understand it, when someone visits my website and tries to access a restricted page, they get a msg (that I create) saying they have to sign up before being allowed to gain access.

I want my page content is being paid for so how do I control the sign up process for an account on my WP site if they have not paid me yet via PayPal?

Is there a flag in their WP account that allows them to create the account but as the admin, I am the only one who can edit their account and set that flag to full access once I determine they have paid?

Thank you…