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This function returns an array of all post IDs that require a paid subscription in order to view.
This is a wrapper for the get_posts() function with the following arguments:
$args = array( 'meta_key' => '_is_paid', 'meta_value' => 1, 'post_status' => 'publish', 'posts_per_page' => -1, 'post_type' => 'any', 'fields' => 'ids' );