Voucher code not visible in order details

Hi, a customer has used one of code generated throught your plugin to generate vouchers in bulk. How can I read the voucher code's number? I usually chek it in order page, but there isn't any number (I'm sure that he used your code). Many thanks 

Coupon code not visible in order details

Hello

Voucher that were generated with the module are the same codes that you can generate manually.

There is not difference between them. So, when someone will use coupon code generated by the module, you will see it in the order details in the same way as other coupons.

Please note that "order details" shows "coupon name" field, not the coupon code.

screenshot for reference: