How to start charging for ads and let specific users being free of charge
Nowadays, I have only one group of users that can signup (free of charge) when their emails match specific patterns. To do that, I adopted a plugin called "User Domain Whitelist / Blacklist", I deactivated both membership packages and charge for listings feature.
But now, I intend to let another group of users, that today can not sign up, to sign up and post ads and being charged for this.
The first group will continue to be free of charge.
So, how can I implement such rule letting some users (that have e-mails of specific domains) sign up being free of charge and, on the other hands, letting other users that do not belong to these specific e-mails being charged for ads?