frontend phase 5 & backend phase 12

server/src/Infrastructure/Baya.Infrastructure.Persistence/Repositories/RefundRepository.cs

@@ -132,6 +132,12 @@ internal sealed class RefundRepository : BaseAsyncRepository<Refund>, IRefundRep
         return new RefundStatusProjection(row.UserId, dto);
     }
 
+    public Task<string?> GetExternalRevertReferenceAsync(long refundId, CancellationToken cancellationToken)
+        => TableNoTracking
+            .Where(r => r.Id == refundId)
+            .Select(r => r.ExternalRevertReference)
+            .FirstOrDefaultAsync(cancellationToken);
+
     // Show only the last 4 characters of an external reference to the customer — never the full PSP/BNPL id.
     private static string? Mask(string? reference)
     {