diff --git a/src/include/api/class-wc-retailcrm-client-v5.php b/src/include/api/class-wc-retailcrm-client-v5.php
index 35ec6a4..fb4e897 100644
--- a/src/include/api/class-wc-retailcrm-client-v5.php
+++ b/src/include/api/class-wc-retailcrm-client-v5.php
@@ -70,6 +70,90 @@ class WC_Retailcrm_Client_V5
         return $this->unversionedClient->makeRequest('/credentials', WC_Retailcrm_Request::METHOD_GET);
     }
 
+    /**
+     * Get cart by id or externalId
+     *
+     * @param $customerId
+     * @param string $site
+     * @param $by (default: 'externalId')
+     *
+     * @return WC_Retailcrm_Response
+     *
+     * @throws InvalidArgumentException
+     * @throws WC_Retailcrm_Exception_Curl
+     * @throws WC_Retailcrm_Exception_Json
+     */
+    public function cartGet($customerId, string $site, $by = 'externalId')
+    {
+        $this->checkIdParameter($by);
+
+        if (empty($site)) {
+            throw new InvalidArgumentException(
+                'Site must be set'
+            );
+        }
+
+        return $this->client->makeRequest(
+            sprintf('/customer-interaction/%s/cart/%s', $site, $customerId),
+            WC_Retailcrm_Request::METHOD_GET,
+            ['by' => $by]
+        );
+    }
+
+    /**
+     * Create or update cart
+     *
+     * @param array $cart
+     * @param string $site
+     *
+     * @return WC_Retailcrm_Response
+     *
+     * @throws InvalidArgumentException
+     * @throws WC_Retailcrm_Exception_Curl
+     * @throws WC_Retailcrm_Exception_Json
+     */
+    public function cartSet(array $cart, string $site)
+    {
+        if (empty($site)) {
+            throw new InvalidArgumentException(
+                'Site must be set'
+            );
+        }
+
+        return $this->client->makeRequest(
+            sprintf('/customer-interaction/%s/cart/set', $site),
+            WC_Retailcrm_Request::METHOD_POST,
+            ['cart' => json_encode($cart)]
+        );
+    }
+
+    /**
+     * Clear customer cart
+     *
+     * @param array $cart
+     * @param string $site
+     *
+     * @return WC_Retailcrm_Response
+     *
+     * @throws InvalidArgumentException
+     * @throws WC_Retailcrm_Exception_Curl
+     * @throws WC_Retailcrm_Exception_Json
+     */
+    public function cartClear(array $cart, string $site)
+    {
+        if (empty($site)) {
+            throw new InvalidArgumentException(
+                'Site must be set'
+            );
+        }
+
+        return $this->client->makeRequest(
+            sprintf('/customer-interaction/%s/cart/clear', $site),
+            WC_Retailcrm_Request::METHOD_POST,
+            ['cart' => json_encode($cart)]
+        );
+    }
+
     /**
      * Returns filtered corporate customers list
      *
diff --git a/tests/datasets/data-cart-retailcrm.php b/tests/datasets/data-cart-retailcrm.php
new file mode 100644
index 0000000..21470e9
--- /dev/null
+++ b/tests/datasets/data-cart-retailcrm.php
@@ -0,0 +1,102 @@
+<?php
+
+namespace datasets;
+
+/**
+ * PHP version 7.0
+ *
+ * Class DataCartRetailCrm - Data set for WC_Cart_Customers_Test.
+ *
+ * @category Integration
+ * @author   RetailCRM <integration@retailcrm.ru>
+ * @license  http://retailcrm.ru Proprietary
+ * @link     http://retailcrm.ru
+ * @see      http://help.retailcrm.ru
+ */
+
+class DataCartRetailCrm
+{
+    public static function dataGetCart() {
+        return [
+            'success' => true,
+            'cart' => [
+                'clearedAt' => new \DateTime('now'),
+                'externalId' => '1',
+                'updateAt' => new \DateTime('now'),
+                'droppedAt' => new \DateTime('now'),
+                'link' => 'https:://link/cart/152',
+                'items' => [
+                    0 => [
+                        'quantity' => 3,
+                        'price' => 1500,
+                        'createdAt' => new \DateTime('now'),
+                        'updatedAt' => new \DateTime('now'),
+                        'offer' => [
+                            'id' => 1,
+                            'externalId' => '1',
+                            'name' => 'test product',
+                            'properties' => [
+                                'prop1' => 'prop',
+                            ],
+                            'unit' => [
+                                'code' => 'test code',
+                                'name' => 'test unit name',
+                                'sym' => 'sym',
+                            ],
+                            'barcode' => '123456789',
+                        ],
+                    ],
+                ],
+            ],
+        ];
+    }
+
+    public static function dataSetCart() {
+        return [
+            'cart' => [
+                'clearedAt' => new \DateTime('now'),
+                'externalId' => '1',
+                'updateAt' => new \DateTime('now'),
+                'droppedAt' => new \DateTime('now'),
+                'link' => 'https:://link/cart/152',
+                'customer' => [
+                    'id' => 1,
+                    'externalId' => '1',
+                    'browserId' => '145874',
+                    'site' => 'test-site',
+                ],
+                'items' => [
+                    0 => [
+                        'quantity' => 3,
+                        'price' => 1500,
+                        'createdAt' => new \DateTime('now'),
+                        'updatedAt' => new \DateTime('now'),
+                        'offer' => [
+                            'id' => 1,
+                            'externalId' => '1',
+                        ],
+                    ],
+                ],
+            ],
+        ];
+    }
+
+    public static function dataClearCart() {
+        return [
+            'cart' => [
+                'clearedAt' => new \DateTime('now'),
+                'customer' => [
+                    'id' => 1,
+                    'externalId' => '1',
+                    'browserId' => '145874',
+                ],
+                'order' => [
+                    'id' => '1',
+                    'externalId' => '1',
+                    'number' => '152C',
+                ],
+            ],
+        ];
+    }
+
+}
diff --git a/tests/test-wc-retailcrm-cart.php b/tests/test-wc-retailcrm-cart.php
new file mode 100644
index 0000000..3648436
--- /dev/null
+++ b/tests/test-wc-retailcrm-cart.php
@@ -0,0 +1,72 @@
+<?php
+
+use datasets\DataCartRetailCrm;
+
+/**
+ * PHP version 7.0
+ *
+ * Class WC_Retailcrm_Cart_Test
+ *
+ * @category Integration
+ * @author   RetailCRM <integration@retailcrm.ru>
+ * @license  http://retailcrm.ru Proprietary
+ * @link     http://retailcrm.ru
+ * @see      http://help.retailcrm.ru
+ */
+class WC_Retailcrm_Cart_Test extends WC_Retailcrm_Test_Case_Helper
+{
+    protected $apiClientMock;
+    protected $responseMock;
+
+    public function setUp()
+    {
+        $this->responseMock = $this->getMockBuilder('\WC_Retailcrm_Response_Helper')
+            ->disableOriginalConstructor()
+            ->setMethods(
+                [
+                    'isSuccessful',
+                    'offsetExists',
+                ]
+            )
+            ->getMock();
+
+        $this->responseMock->setResponse(['id' => 1]);
+
+        $this->apiClientMock = $this->getMockBuilder('\WC_Retailcrm_Client_V5')
+            ->disableOriginalConstructor()
+            ->setMethods(
+                [
+                    'cartGet',
+                    'cartSet',
+                    'cartClear',
+                ]
+            )
+            ->getMock();
+
+        $this->setMockResponse($this->responseMock, 'isSuccessful', true);
+        $this->setMockResponse($this->responseMock, 'offsetExists', true);
+        $this->setMockResponse($this->apiClientMock, 'cartSet', $this->responseMock);
+        $this->setMockResponse($this->apiClientMock, 'cartClear', $this->responseMock);
+        $this->setMockResponse($this->apiClientMock, 'cartGet',$this->responseMock);
+    }
+
+    public function testGetCart()
+    {
+        $this->responseMock->setResponse(DataCartRetailCrm::dataGetCart());
+        $response = $this->apiClientMock->cartGet(1, 'test-site');
+        $this->assertNotEmpty($response->__get('cart'));
+        $this->assertTrue($response->__get('success'));
+    }
+
+    public function testSetCart()
+    {
+        $response = $this->apiClientMock->cartSet(DataCartRetailCrm::dataSetCart(), 'test-site');
+        $this->assertEquals(1, $response->__get('id'));
+    }
+
+    public function testClearCart()
+    {
+        $response = $this->apiClientMock->cartClear(DataCartRetailCrm::dataClearCart(), 'test-site');
+        $this->assertEquals(1, $response->__get('id'));
+    }
+}