feat(back-end and front-end) email

backend/src/main/java/com/printcalculator/controller/admin/AdminOrderController.java

@@ -101,13 +101,16 @@ public class AdminOrderController {
 
     @PostMapping("/{orderId}/payments/confirm")
     @Transactional
-    public ResponseEntity<OrderDto> confirmPayment(
+    public ResponseEntity<OrderDto> updatePaymentMethod(
             @PathVariable UUID orderId,
             @RequestBody(required = false) Map<String, String> payload
     ) {
         getOrderOrThrow(orderId);
         String method = payload != null ? payload.get("method") : null;
-        paymentService.confirmPayment(orderId, method);
+        if (method == null || method.isBlank()) {
+            throw new ResponseStatusException(BAD_REQUEST, "Payment method is required");
+        }
+        paymentService.updatePaymentMethod(orderId, method);
         return ResponseEntity.ok(toOrderDto(getOrderOrThrow(orderId)));
     }
 

backend/src/main/java/com/printcalculator/service/PaymentService.java

@@ -98,4 +98,20 @@ public class PaymentService {
 
         return payment;
     }
+
+    @Transactional
+    public Payment updatePaymentMethod(UUID orderId, String method) {
+        if (method == null || method.isBlank()) {
+            throw new IllegalArgumentException("Payment method is required");
+        }
+
+        Order order = orderRepo.findById(orderId)
+                .orElseThrow(() -> new RuntimeException("Order not found with id " + orderId));
+
+        Payment payment = paymentRepo.findByOrder_Id(orderId)
+                .orElseGet(() -> getOrCreatePaymentForOrder(order, "OTHER"));
+
+        payment.setMethod(method.trim().toUpperCase());
+        return paymentRepo.save(payment);
+    }
 }