get( \Magento\Sales\Model\ResourceModel\Order\Creditmemo\Collection::class ); $creditmemo = $creditmemoCollection->getFirstItem(); $serviceInfo = [ 'rest' => [ 'resourcePath' => '/V1/creditmemo/' . $creditmemo->getId(), 'httpMethod' => \Magento\Framework\Webapi\Rest\Request::HTTP_METHOD_PUT, ], 'soap' => [ 'service' => self::SERVICE_NAME, 'serviceVersion' => self::SERVICE_VERSION, 'operation' => self::SERVICE_NAME . 'cancel', ], ]; $requestData = ['id' => $creditmemo->getId()]; $this->_webApiCall($serviceInfo, $requestData); } }