Performing the metadata update

wp-pdf-helper.php

@@ -57,7 +57,14 @@ function wpdfh_enqueue_admin_scripts() {
 
 add_action( "wp_ajax_wpdfh_set_print_metadata", "wpdfh_set_print_metadata" );
 function wpdfh_set_print_metadata(){
-    error_log("PHP: wpdfh_set_print_metadata", 0);
+    error_log("PHP: wpdfh_set_print_metadata, \$_POST:".print_r($_POST, true), 0);
+    $post_id = $_POST['post_id'];
+    $checked = $_POST['checked'];
+    if ($checked == 'true') {
+        update_post_meta($post_id, 'wpdfh.print', 'always');
+    } else {
+        delete_post_meta($post_id, 'wpdfh.print');
+    }
     wp_send_json_success();
 }