rcp_get_restricted_post_ids()
Note: This is part of the developer docs and is considered custom code.
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If you need assistance with this, please reach out to our list of consultants for further assistance:
https://codeable.io/developers/restrict-content-pro/
Returns an array of post IDs that have post-level restrictions defined via the “Restrict this content” meta box.
The return value is saved in a transient for one day to help with performance.