Add thousands of gift certificate codes to WooCommerce (WordPress)

We have an eCommerce site running on WooCommerce/WordPress We would like to send out physical gift cards to hundreds or thousands of people. We can put each unique number into the Coupons tab of WooCommerce but, with thousands of coupons, that would be extremely tedious. We would like someone who can create a plugin or otherwise alter the code so that we can do import hundreds or thousands of unique gift card details at once.