Gift Certificate from ProductDyno
As stated on the gift certificate and in your welcome email, the gift certificate is valid for products purchased from our catalog at https://promotelabs.com
PerkZilla is not in the catalog at https://promotelabs.com so the gift certificate cannot be used for this purchase. There are WP Plugins, PLR products, training, membership sites, etc, etc. Do go take a look.
We thank you for understanding