Cant complete order

IF you are having issues with the plugin and you cant complete the order e.g. the checkout stucks, try editing the file /plugins/woo-instant-notifications/admin/class-wcnotifications-admin.php . Delete the content on line 47 and add the following:

add_action( ‘woocommerce_new_order’, array( $this, ‘do_email_actions’ ), 10, 2 );