I am using Events Calendar Pro in Wordpress and have set up an Additional Field which I would like to change the value of in my functions.php code. The field is a dropdown with 2 options that I would like to switch between on each event based on a condition.
So far I've used update_post_meta($post_id, '_ecp_custom_2', 'Available'); however this doesn't seem to do anything. When manually setting the field value then var dumping the result of get_post_meta($post_id, '_ecp_custom_2', true) it shows the correct value so _ecp_custom_2 must be right?