feat: implement identity authentication, authorization policies, and MAUI platform support with Docker orchestration

src/NexusReader.Application/Abstractions/Services/IBillingService.cs

@@ -0,0 +1,9 @@
+using NexusReader.Domain.Entities;
+
+namespace NexusReader.Application.Abstractions.Services;
+
+public interface IBillingService
+{
+    Task<bool> HandleSubscriptionUpdatedAsync(string customerEmail, string stripeProductId);
+    Task<bool> HandleSubscriptionDeletedAsync(string customerEmail);
+}