haciendo datatables de los pagos

src/main/java/com/imprimelibros/erp/cart/CartService.java

@@ -53,6 +53,14 @@ public class CartService {
         this.pedidoService = pedidoService;
     }
 
+
+    public Cart findById(Long cartId) {
+        return cartRepo.findById(cartId)
+                .orElseThrow(() -> new IllegalArgumentException("Carrito no encontrado"));
+    }
+
+    
+
     /** Devuelve el carrito activo o lo crea si no existe. */
     @Transactional
     public Cart getOrCreateActiveCart(Long userId) {
@@ -136,6 +144,14 @@ public class CartService {
         cartRepo.save(cart);
     }
 
+    @Transactional
+    public void lockCartById(Long cartId) {
+        Cart cart = cartRepo.findById(cartId)
+                .orElseThrow(() -> new IllegalArgumentException("Carrito no encontrado"));
+        cart.setStatus(Cart.Status.LOCKED);
+        cartRepo.save(cart);
+    }
+
     @Transactional
     public long countItems(Long userId) {
         Cart cart = getOrCreateActiveCart(userId);
@@ -293,6 +309,7 @@ public class CartService {
         summary.put("total", Utils.formatCurrency(total, locale));
         summary.put("amountCents", Math.round(total * 100));
         summary.put("errorShipmentCost", errorShipementCost);
+        summary.put("cartId", cart.getId());
 
         return summary;
     }