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Thanks @ChrisHaas for figuring it out. The solution was to use the fully qualified class name and since it was a static function the correct code was:

<?php 
add_action( 'wp_ajax_nopriv_run_cff_clear_feed', 'myCFFclearFeed');

function myCFFclearFeed() {
   require_once '/var/www/wp-content/plugins/custom-facebook-feed-pro/inc/Builder/CFF_Feed_Saver_Manager.php';
      require_once '/var/www/wp-content/plugins/custom-facebook-feed-pro/inc/CFF_Cache.php';
\CustomFacebookFeed\Builder\CFF_Feed_Saver_Manager::clear_single_feed_cache();
                }
?>

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Posted by: Mike Muller

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