src/Shipping.php
public function void($shipmentData)
    {
        if (is_array($shipmentData) && !isset($shipmentData['shipmentId'])) {
            throw new InvalidArgumentException('$shipmentData parameter is required to contain a key `shipmentId`.');
        }

        $request = $this->createVoidRequest($shipmentData);
        $this->response = $this->getRequest()->request($this->createAccess(), $request, $this->compileEndpointUrl($this->voidEndpoint));
        $response = $this->response->getResponse();

        if ($response->Response->ResponseStatusCode == 0) {
            throw new Exception(
                "Failure ({$response->Response->Error->ErrorSeverity}): {$response->Response->Error->ErrorDescription}",
                (int)$response->Response->Error->ErrorCode
            );
        } else {
            unset($response->Response);

            return $this->formatResponse($response);
        }
    }
public function void($shipmentData)
    {
        if (is_array($shipmentData) && !isset($shipmentData['shipmentId'])) {
            throw new InvalidArgumentException('$shipmentData parameter is required to contain a key `shipmentId`.');
        }

        $request = $this->createVoidRequest($shipmentData);
        $this->response = $this->getRequest()->request($this->createAccess(), $request, $this->compileEndpointUrl($this->voidEndpoint));
        $response = $this->response->getResponse();

        if ($response->Response->ResponseStatusCode == 0) {
            throw new Exception(
                "Failure ({$response->Response->Error->ErrorSeverity}): {$response->Response->Error->ErrorDescription}",
                (int)$response->Response->Error->ErrorCode
            );
        } else {
            unset($response->Response);

            return $this->formatResponse($response);
        }
    }
Void a shipping label / request.

@param string|array $shipmentData Either the UPS Shipment Identification Number or an array of
expanded shipment data [shipmentId:, trackingNumbers:[...]]

@throws Exception

@return \stdClass