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Note: This is part of the developer docs and is considered custom code.
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rcp_get_content_subscription_levels( $post_id )
This function will return the subscription level(s) a given post is restricted to.
Parameters:

$post_id – ID of the post you’d like to get the required subscription levels for.

Possible return values:

false – No subscription level restrictions.

any – Restricted to any subscription level.

any-paid – Restricted to any paid subscription level.
(array) An array of subscription level IDs that the post is restricted to.