With Realty you can charge a „subscriber” for publishing their properties on your site, rather than giving this option for free.
Users with a role of „admin” or „agent” are considered in-house and there for always submit properties for free. To charge a third party make sure their user role is set to „subscriber”.
Charge subscribers per-listing or for any of your membership packages (see below for more details). You can also choose beween one-time and recurring subscriptions.
Supported payment methods are PayPal and Stripe. Payment settings are located under „Appearance > Theme Options > Property Submit”.