Hello,
We do not know how the plugin was coded / developed because we did not create this plugin. It is a third party plugin. We can provide support for our products only.
Please contact the plugin support and ask them: https://www.tychesoftwares.com/forums/forum/order-delivery-date-pro-for-woocommerce/
And
https://www.tychesoftwares.com/contact/
