Seal Subscriptions App

Updated: The application worked fine, but it didn't work for what I wanted to accomplish. I will try the app again when the update occurs in mid-January when I was told they will roll out fixed price discounts. The app is good, I'm just disappointed because it didn't work at this moment. Old: Installed the application and just needed a fixed price discount amount. You can only do percentages. Tried to circumvent by creating a Shopify Discount code for the fixed-rate amount, but received a "discount code isn’t valid for the items in your cart" - I'm not sure if this is a Shopify issue or app issue. Will continue working on it to figure it out.
Specific Product Page:
https://www.petzpaws.com/products/petzpaws-ez-clean-towelette
Hope I receive a solution from Seal Subscription - trying to roll this out asap.
Thank you,
Brian