[Pre-purchase question] Private WordPress

Hello,

I’ve used your plugin in free version for a moment but now there is some restriction on my website : user must be logged by SSO authentication (with redirection on a custom login page if user is not logged in).

Note : The website can be accessible with a classic WordPress authentication (by accessing wp-login page directly)

There is a way to test the Pro version of your plugin or there is a refund policies after purchase ?

Thank you in advance,