Sale products by voucher codes [closed]

I have a WordPress site where I want to sell courses using offline voucher codes via WooCommerce. Here’s what I’m trying to achieve:

1.  I will sell the voucher codes offline (outside the website).
2.  The voucher codes should allow students to:
•   Automatically enroll in a specific course.
•   Or purchase another product for free not discount only free.

Important Note:

•   The voucher codes will not be displayed or sold as products on WooCommerce.
•   WooCommerce products will only display the courses and other items available for purchase.

How can I implement this functionality in WooCommerce or with additional plugins? Is there a way to link the voucher codes directly to course enrollment or product purchases?

Thank you for your help!