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wolverine/a-frame-architecture/FinancialApi.Application/Class1.cs

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+namespace FinancialApi.Application;
+
+public record Account(int Id, decimal Balance)
+{
+    public Account ApplyFee(decimal amount)
+    {
+        if (amount <= 0) 
+            throw new ArgumentException("Fee must be positive.");
+            
+        if (Balance - amount < 0)
+            throw new InvalidOperationException("Insufficient funds.");
+
+        // Returns a brand new record with the updated balance
+        return this with { Balance = Balance - amount };
+    }
+}