Detect meta value changes when post is updated (post_updated)
Like @SamuelElh comment this is how I solved it: add_action(‘updated_post_meta’, ‘check_meta_change’, 0, 4); function check_meta_change($meta_id, $post_id, $meta_key, $meta_value) { if( ‘<ENTER YOUR META KEY>’ == $meta_key ) { // do stuff } }