I've created a custom post type and would like to send those posts to FB Instant Articles and Apple News via a RSS feed. I've created a custom RSS feed and need to know what's the best way to make that feed password-protected. The CPT is called limitedrun. The feed URL is domain.com/?feed=ltdrun and the RSS template is called rss-ltdrun.php
I know there are plugins that do this but it's not what I'm looking for. They password protect the entire site in order to make the RSS feed password-protected. I need the opposite: RSS password-protected and the website open.