public function updateCustomer(RequestModels\CustomerUpdate $requestModel)
 {
     $customrMapper = new CustomerMapper($requestModel);
     $requestPayload = array('authorization' => $this->_apiSetting->getSecretKey(), 'mode' => $this->_apiSetting->getMode(), 'postedParam' => $customrMapper->requestPayloadConverter());
     $updateCustomerUri = $this->_apiUrl->getCustomersApiUri() . '/' . $requestModel->getCustomerId();
     $processCharge = \com\checkout\helpers\ApiHttpClient::putRequest($updateCustomerUri, $this->_apiSetting->getSecretKey(), $requestPayload);
     $responseModel = new \com\checkout\ApiServices\SharedModels\OkResponse($processCharge);
     return $responseModel;
 }