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[omarfilip]

Check out the Subscriptions plugin which has a free trial option:

Discourse Subscriptions Plugin

Summary The Discourse Subscriptions plugin allows site owners to sell recurring and one-time purchase subscriptions that grant access to a group on a Discourse instance. Install Guide This plugin is bundled with Discourse core. There is no need to install the plugin separately. The Discourse Subscriptions plugin allows you to create one-time as well as recurring subscriptions that users can pay for in order to access gated content. This can be a great …