diff --git a/retailcrm/include/class-wc-retailcrm-base.php b/retailcrm/include/class-wc-retailcrm-base.php
index 746f9f5..f9002ef 100644
--- a/retailcrm/include/class-wc-retailcrm-base.php
+++ b/retailcrm/include/class-wc-retailcrm-base.php
@@ -23,6 +23,10 @@ if ( ! class_exists( 'WC_Retailcrm_Base' ) ) :
     public function __construct() {
         //global $woocommerce;
 
+        if ( ! class_exists( 'WC_Retailcrm_Proxy' ) ) {
+            include_once( __DIR__ . '/api/class-wc-retailcrm-proxy.php' );
+        }
+        
         $this->id                 = 'integration-retailcrm';
         $this->method_title       = __( 'RetailCRM', 'woocommerce-integration-retailcrm' );
         $this->method_description = __( 'Интеграция с системой управления Retailcrm.', 'woocommerce-integration-retailcrm' );
@@ -81,10 +85,6 @@ if ( ! class_exists( 'WC_Retailcrm_Base' ) ) :
 
         if ($this->get_option( 'api_url' ) != '' && $this->get_option( 'api_key' ) != '') {
 
-            if ( ! class_exists( 'WC_Retailcrm_Proxy' ) ) {
-                include_once( __DIR__ . '/api/class-wc-retailcrm-proxy.php' );
-            }
-
             $retailcrm = new WC_Retailcrm_Proxy(
                 $this->get_option( 'api_url' ),
                 $this->get_option( 'api_key' ),
@@ -282,13 +282,29 @@ if ( ! class_exists( 'WC_Retailcrm_Base' ) ) :
             $value
         );
 
-        $response = $api->statisticUpdate();
+        $response = $api->deliveryTypesList();
         
-        if ($response['errorMsg'] == 'API method not found') {
-            WC_Admin_Settings::add_error( esc_html__( '"Выбранная версия API недоступна"', 'woocommerce-integration-demo' ) );
-        }
+        if (isset($response['errorMsg']) && $response['errorMsg'] == 'API method not found') {
+            WC_Admin_Settings::add_error( esc_html__( '"Выбранная версия API недоступна"', 'woocommerce-integration-retailcrm' ) );
+        } else {
+            return $value;
+        } 
+    }
 
-        return $value;
+    public function validate_api_url_field( $key, $value ) {
+        $api = new WC_Retailcrm_Proxy(
+            $value,
+            $_POST['woocommerce_integration-retailcrm_api_key'],
+            'v4'
+        );
+
+        $response = $api->deliveryTypesList();
+        
+        if ($response == NULL) {
+            WC_Admin_Settings::add_error( esc_html__( '"Введите корректный адрес CRM"', 'woocommerce-integration-retailcrm' ) );
+        } else {
+            return $value;
+        }
     }
 }