Custom variable

I am using Shipment Tracking https://woocommerce.com/products/shipment-tracking/ They are using Custom meta fields ‘_tracking_provider’ ‘_custom_tracking_provider’ ‘_tracking_number’ ‘_custom_tracking_link’ ‘_date_shipped’ we wrote _tracking_number in Custom variables section of setting page then we add %_tracking_number% (or _tracking_number) in Order Completed message section, but in sms it is not showing tracking number instead its shows _tracking_number Please resolve this issue You can try our plug in https://wordpress.org/plugins/sms-notifications-for-woocommerce/