Can you tell me how to use sandbox in woocommerce??

Hello, I've tried to use sandbox in woocommerce, but it didn't work.
I followed https://developers.easyship.com/docs/authentication to generate sandbox token. However, it didn't show shipment in cart page...

Could you please tell me if I need to fill the Callback URL in Sandbox?? Or is there any field I need to fill out???