diff --git a/backend/src/main/java/com/petshop/backend/service/SaleService.java b/backend/src/main/java/com/petshop/backend/service/SaleService.java
index b426dc38..b8d5861e 100644
--- a/backend/src/main/java/com/petshop/backend/service/SaleService.java
+++ b/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;
+    }
 }
diff --git a/backend/src/main/resources/db/migration/V10__remove_debit_payment_method.sql b/backend/src/main/resources/db/migration/V10__remove_debit_payment_method.sql
new file mode 100644
index 00000000..874b0205
--- /dev/null
+++ b/backend/src/main/resources/db/migration/V10__remove_debit_payment_method.sql
@@ -0,0 +1,3 @@
+UPDATE sale
+SET paymentMethod = 'Card'
+WHERE LOWER(paymentMethod) = 'debit';
diff --git a/backend/src/main/resources/db/migration/V2__seed_data.sql b/backend/src/main/resources/db/migration/V2__seed_data.sql
index 5e8d3fb6..d7308ad4 100644
--- a/backend/src/main/resources/db/migration/V2__seed_data.sql
+++ b/backend/src/main/resources/db/migration/V2__seed_data.sql
@@ -128,7 +128,7 @@ VALUES
 ('2026-01-05 09:15:00', 125.00, 'Card', 1, 1, 1),
 ('2026-01-08 11:30:00', 200.00, 'Card', 2, 1, 2),
 ('2026-01-12 14:20:00', 60.00, 'Cash', 3, 2, 3),
-('2026-01-15 10:45:00', 150.00, 'Debit', 1, 1, 1),
+('2026-01-15 10:45:00', 150.00, 'Card', 1, 1, 1),
 ('2026-01-18 16:30:00', 80.00, 'Card', 4, 3, 2),
 ('2026-01-22 13:15:00', 95.00, 'Cash', 2, 2, NULL),
 ('2026-01-25 15:40:00', 240.00, 'Card', 5, 4, 4),
@@ -136,12 +136,12 @@ VALUES
 ('2026-02-01 09:00:00', 175.00, 'Card', 3, 3, 1),
 ('2026-02-03 11:20:00', 120.00, 'Card', 2, 1, 3),
 ('2026-02-05 14:50:00', 45.00, 'Cash', 4, 2, NULL),
-('2026-02-08 16:15:00', 160.00, 'Debit', 1, 1, 2),
+('2026-02-08 16:15:00', 160.00, 'Card', 1, 1, 2),
 ('2026-02-10 10:25:00', 100.00, 'Card', 5, 4, NULL),
 ('2026-02-12 13:45:00', 50.00, 'Cash', 2, 2, 1),
 ('2026-02-15 15:30:00', 85.00, 'Card', 3, 3, NULL),
 ('2026-02-18 11:10:00', 200.00, 'Card', 1, 1, 4),
-('2026-02-20 14:35:00', 155.00, 'Debit', 4, 3, NULL),
+('2026-02-20 14:35:00', 155.00, 'Card', 4, 3, NULL),
 ('2026-02-22 16:50:00', 75.00, 'Cash', 2, 1, 2),
 ('2026-02-24 10:15:00', 140.00, 'Card', 5, 4, NULL),
 (NOW(), 95.00, 'Card', 1, 1, 1);
diff --git a/backend/src/test/java/com/petshop/backend/service/SaleServiceTest.java b/backend/src/test/java/com/petshop/backend/service/SaleServiceTest.java
new file mode 100644
index 00000000..b0ffeded
--- /dev/null
+++ b/backend/src/test/java/com/petshop/backend/service/SaleServiceTest.java
@@ -0,0 +1,17 @@
+package com.petshop.backend.service;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SaleServiceTest {
+
+    @Test
+    void normalizePaymentMethodMapsDebitToCard() {
+        SaleService saleService = new SaleService(null, null, null, null, null, null, null, null);
+
+        assertEquals("Card", saleService.normalizePaymentMethod("Debit"));
+        assertEquals("Card", saleService.normalizePaymentMethod("debit"));
+        assertEquals("Cash", saleService.normalizePaymentMethod("Cash"));
+    }
+}