show subscribers after they have paid

Hi,
I’m using your plugin with a form from Gravity Forms. Through this form they can subscribe to an event, there is a paymant behind it. I only want to show those who have paid for this event. How can I make this work in your plugin, do I need a special shortcode for this?

Many thanks in advance.

Kind greetings,
Jitske

https://www.ads-software.com/plugins/contact-form-7-to-database-extension/