How to get refund coin using bitpay testnet

Hello,

I am using Bitpay woocommerce plugin for bitcoin payment with test environment (testnet) now, i have got some coin to test it, now everything is working and payment has made successfully.

But after payment i want to refund the amount from backend (https://prntscr.com/l4cb7p)
but i have not received bitcoins on bitpay account wallet (testnet), so is this possible to receive refund coin using testnet or it will work only live environment or is there a another way to refund the amount (coin) with it?

Thanks & Regards
Yash