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

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+using FinancialApi.Application;
+using FinancialApi.Infrastructure;
+using Microsoft.EntityFrameworkCore;
+
+namespace FinancialApi;
+
+public static class ApplyFeeHandler
+{
+    public static Task<Account?> LoadAsync(ApplyFeeCommand cmd, AccountDbContext db)
+        => db.Set<Account>().AsNoTracking()
+            .FirstOrDefaultAsync(x => x.Id == cmd.AccountId);
+
+    public static (Account UpdatedAccount, FeeAppliedEvent Event) Handle(ApplyFeeCommand cmd, Account account)
+    {
+        var updatedAccount = account.ApplyFee(cmd.Amount);
+
+        var @event = new FeeAppliedEvent(account.Id, cmd.Amount);
+
+        return (updatedAccount, @event);
+    }
+}
+
+public record ApplyFeeCommand(int AccountId, decimal Amount);
+
+public record FeeAppliedEvent(int AccountId, decimal Amount);