Oh I see, There are a couple of options that allow you to take payment and associate it with forum membership.
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You can integrate with Memberful
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Use the Patreon plugin: Discourse Patreon Integration
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Or you could set up a Wordpress site to take payments via a Wordpress plugin and manage users that way: Managing Discourse group membership with WP Discourse
We’re planning to add a way to accept payments within Discourse directly in the future, but don’t have an exact date yet.