I’ve not seen anyone do WooCommerce subscriptions. Look in WordPress - Discourse Meta and you’ll find examples for things like MemberMouse and Paid memberships pro. It sounds like you should be able to find examples that will give you enough to go on.
Oh. check this Manage group membership in Discourse with WP Discourse SSO
Search results for 'wp-discourse #howto ' - Discourse Meta is how to find that.