Added a transfer funds handler using a-frame and wolverine.

wolverine/a-frame-architecture/FinancialApi.Infrastructure/ApplyFeeHandler.cs

@@ -0,0 +1,29 @@
+using FinancialApi.Application;
+using Microsoft.EntityFrameworkCore;
+using Wolverine.Attributes;
+using Wolverine.Persistence;
+
+namespace FinancialApi.Infrastructure;
+
+public static class ApplyFeeHandler
+{
+    public static Task<Account?> LoadAsync(
+        ApplyFeeCommand cmd,
+        AccountDbContext db) => db.Accounts.AsNoTracking().SingleOrDefaultAsync(x => x.Id == cmd.AccountId);
+
+    [Transactional]
+    public static (IStorageAction<Account> UpdatedAccount, FeeAppliedEvent Event) Handle(
+        ApplyFeeCommand cmd,
+        Account account)
+    {
+        var updatedAccount = account.ApplyFee(cmd.Amount);
+
+        var @event = new FeeAppliedEvent(account.Id, cmd.Amount);
+
+        return (Storage.Update(updatedAccount), @event);
+    }
+}
+
+public record ApplyFeeCommand(int AccountId, decimal Amount);
+
+public record FeeAppliedEvent(int AccountId, decimal Amount);