Creating a Journal Reversal handler.

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

@@ -8,9 +8,11 @@ public record ApplyFeeCommand(int AccountId, decimal Amount);
 
 public record FeeAppliedEvent(int AccountId, decimal Amount);
 
+public record FeePair(Account Source, Account Destination);
+
 public static class ApplyFeeHandler
 {
-    public static async Task<(Account, Account)> LoadAsync(
+    public static async Task<FeePair> LoadAsync(
         ApplyFeeCommand cmd,
         IAccountQuery query)
     {
@@ -20,7 +22,7 @@ public static class ApplyFeeHandler
         {
             throw new InvalidOperationException($"Cannot process transfer. Account(s) not found.");
         }
-        return (source, dest);
+        return new FeePair(source, dest);
     }
 
     public static (
@@ -31,12 +33,11 @@ public static class ApplyFeeHandler
         )
         Handle(
             ApplyFeeCommand cmd,
-            Account source,
-            Account dest
+            FeePair pair
         )
     {
-        var updatedSource = source.ApplyPosting(cmd.Amount, EntryType.Debit);
-        var updatedRevenue = dest.ApplyPosting(cmd.Amount, EntryType.Credit);
+        var updatedSource = pair.Source.ApplyPosting(cmd.Amount, EntryType.Debit);
+        var updatedRevenue = pair.Destination.ApplyPosting(cmd.Amount, EntryType.Credit);
         var lines = new List<JournalLine>
         {
             new(updatedSource.Id, cmd.Amount, EntryType.Debit),