Add subscription pricing and Base drawing limit

Services/IPlayBillingService.cs

@@ -2,13 +2,22 @@ namespace LMEMappeCatastaliApp.Services;
 
 public interface IPlayBillingService
 {
+    Task<IReadOnlyList<PlaySubscriptionPlan>> GetSubscriptionPlansAsync(CancellationToken cancellationToken = default);
     Task<PlayBillingResult> RestoreAsync(CancellationToken cancellationToken = default);
     Task<PlayBillingResult> PurchaseAsync(string basePlanId, CancellationToken cancellationToken = default);
 }
 
-public sealed record PlayBillingResult(bool Completed, bool HasActiveSubscription, bool UserCancelled, string Message)
+public sealed record PlaySubscriptionPlan(string BasePlanId, string FormattedPrice, string BillingPeriod);
+
+public sealed record PlayBillingResult(
+    bool Completed,
+    bool HasActiveSubscription,
+    bool UserCancelled,
+    string Message,
+    string? PurchaseToken = null)
 {
-    public static PlayBillingResult Active(string message) => new(true, true, false, message);
+    public static PlayBillingResult Active(string message, string? purchaseToken = null) =>
+        new(true, true, false, message, purchaseToken);
     public static PlayBillingResult Base(string message) => new(true, false, false, message);
     public static PlayBillingResult Cancelled(string message) => new(false, false, true, message);
     public static PlayBillingResult Failed(string message) => new(false, false, false, message);
@@ -16,6 +25,9 @@ public sealed record PlayBillingResult(bool Completed, bool HasActiveSubscriptio
 
 public sealed class UnavailablePlayBillingService : IPlayBillingService
 {
+    public Task<IReadOnlyList<PlaySubscriptionPlan>> GetSubscriptionPlansAsync(CancellationToken cancellationToken = default) =>
+        Task.FromResult<IReadOnlyList<PlaySubscriptionPlan>>([]);
+
     public Task<PlayBillingResult> RestoreAsync(CancellationToken cancellationToken = default) =>
         Task.FromResult(PlayBillingResult.Failed("Google Play Billing è disponibile solo nell'app Android installata da Google Play."));