Welcome to Shopify Community. My name is Olivia and I work here.
I'd love to help you out with this today. To provide some context, app billing is actually separate from your Shopify subscription billing, though it is invoiced via Shopify. Therefore, App Devs must authorize app-related refunds. To move forward with a refund follow these steps:
That's it! Let me know if you run into any trouble or have further questions and I'd love to help you out.
Thanks for your reply, @Mshop1.
As I mentioned earlier, app refunds must be requested from the the App Developer directly. Let me know if you have any further questions around this.