Remove debit payment data

backend/src/main/java/com/petshop/backend/service/SaleService.java

@@ -78,7 +78,7 @@ public class SaleService {
         sale.setSaleDate(LocalDateTime.now());
         sale.setEmployee(employee);
         sale.setStore(store);
-        sale.setPaymentMethod(request.getPaymentMethod());
+        sale.setPaymentMethod(normalizePaymentMethod(request.getPaymentMethod()));
         sale.setIsRefund(request.getIsRefund() != null ? request.getIsRefund() : false);
 
         if (request.getCustomerId() != null) {
@@ -215,4 +215,22 @@ public class SaleService {
 
         return response;
     }
+
+    String normalizePaymentMethod(String paymentMethod) {
+        if (paymentMethod == null) {
+            return null;
+        }
+
+        String normalized = paymentMethod.trim();
+        if (normalized.equalsIgnoreCase("Debit")) {
+            return "Card";
+        }
+        if (normalized.equalsIgnoreCase("Cash")) {
+            return "Cash";
+        }
+        if (normalized.equalsIgnoreCase("Card")) {
+            return "Card";
+        }
+        return normalized;
+    }
 }