diff --git a/includes/Api/OrdersController.php b/includes/Api/OrdersController.php
index 24eb07b..39e7b90 100644
--- a/includes/Api/OrdersController.php
+++ b/includes/Api/OrdersController.php
@@ -1236,6 +1236,15 @@ class OrdersController {
     }
 
     try {
+      // Initialize WooCommerce cart and session if not already
+      if ( ! WC()->cart ) {
+        wc_load_cart();
+      }
+      if ( ! WC()->session ) {
+        WC()->session = new \WC_Session_Handler();
+        WC()->session->init();
+      }
+      
       // Create a temporary cart to calculate shipping
       WC()->cart->empty_cart();
       
@@ -1319,6 +1328,15 @@ class OrdersController {
     }
 
     try {
+      // Initialize WooCommerce cart and session if not already
+      if ( ! WC()->cart ) {
+        wc_load_cart();
+      }
+      if ( ! WC()->session ) {
+        WC()->session = new \WC_Session_Handler();
+        WC()->session->init();
+      }
+      
       // Use WooCommerce cart for calculation
       WC()->cart->empty_cart();