src/Api/AbstractApi.php
protected function call($service, $method, array $parameters = [])
    {
        return $this->getSoapClient($service, $method, $parameters)->__call($method, $parameters);
    }
protected function call($service, $method, array $parameters = [])
    {
        return $this->getSoapClient($service, $method, $parameters)->__call($method, $parameters);
    }
Make a SOAP call.

@param string $service    WSDL service used for the call
@param string $method     Method used for the call
@param array  $parameters Parameters used for the call

@return mixed