diff --git a/src/include/abstracts/class-wc-retailcrm-abstracts-address.php b/src/include/abstracts/class-wc-retailcrm-abstracts-address.php
index b27cdc8..f951aec 100644
--- a/src/include/abstracts/class-wc-retailcrm-abstracts-address.php
+++ b/src/include/abstracts/class-wc-retailcrm-abstracts-address.php
@@ -27,4 +27,26 @@ abstract class WC_Retailcrm_Abstracts_Address extends WC_Retailcrm_Abstracts_Dat
             'text' => '',
         );
     }
+
+    /**
+     * Returns state name by it's code
+     *
+     * @param string $countryCode
+     * @param string $stateCode
+     *
+     * @return string
+     */
+    protected function get_state_name($countryCode, $stateCode)
+    {
+        if (preg_match('/^[A-Z\-0-9]{0,5}$/', $stateCode) && !is_null($countryCode)) {
+            $countriesProvider = new WC_Countries();
+            $states = $countriesProvider->get_states($countryCode);
+
+            if (!empty($states) && array_key_exists($stateCode, $states)) {
+                return (string) $states[$stateCode];
+            }
+        }
+
+        return $stateCode;
+    }
 }
diff --git a/src/include/class-wc-retailcrm-history.php b/src/include/class-wc-retailcrm-history.php
index 900329c..3ad26b3 100644
--- a/src/include/class-wc-retailcrm-history.php
+++ b/src/include/class-wc-retailcrm-history.php
@@ -628,7 +628,8 @@ if ( ! class_exists( 'WC_Retailcrm_History' ) ) :
                     }
 
                     if (!empty($arItemsOld)) {
-                        $result = end(array_diff($arItemsNew, $arItemsOld));
+                        $diff = array_diff($arItemsNew, $arItemsOld);
+                        $result = end($diff);
                     } else {
                         $result = end($arItemsNew);
                     }
diff --git a/src/include/customer/class-wc-retailcrm-customer-address.php b/src/include/customer/class-wc-retailcrm-customer-address.php
index 621fc72..198f170 100644
--- a/src/include/customer/class-wc-retailcrm-customer-address.php
+++ b/src/include/customer/class-wc-retailcrm-customer-address.php
@@ -26,7 +26,7 @@ class WC_Retailcrm_Customer_Address extends WC_Retailcrm_Abstracts_Address
         $data = array(
             'index' => $customer->get_billing_postcode(),
             'countryIso' => $customer->get_billing_country(),
-            'region' => $customer->get_billing_state(),
+            'region' => $this->get_state_name($customer->get_billing_country(), $customer->get_billing_state()),
             'city' => $customer->get_billing_city(),
             'text' => $customer->get_billing_address_1() . ', ' . $customer->get_billing_address_2()
         );
diff --git a/src/include/order/class-wc-retailcrm-order-address.php b/src/include/order/class-wc-retailcrm-order-address.php
index 308d70f..82522d3 100644
--- a/src/include/order/class-wc-retailcrm-order-address.php
+++ b/src/include/order/class-wc-retailcrm-order-address.php
@@ -26,7 +26,7 @@ class WC_Retailcrm_Order_Address extends WC_Retailcrm_Abstracts_Address
             $data = array(
                 'index' => $address['postcode'],
                 'city' => $address['city'],
-                'region' => $address['state']
+                'region' => $this->get_state_name($address['country'], $address['state'])
             );
 
             $this->set_data_fields($data);