public function create($friendlyName, $configuration, $options = array()) {
        $options = new Values($options);

        $data = Values::of(array(
            'FriendlyName' => $friendlyName,
            'Configuration' => $configuration,
            'AssignmentCallbackUrl' => $options['assignmentCallbackUrl'],
            'FallbackAssignmentCallbackUrl' => $options['fallbackAssignmentCallbackUrl'],
            'TaskReservationTimeout' => $options['taskReservationTimeout'],
        ));

        $payload = $this->version->create(
            'POST',
            $this->uri,
            array(),
            $data
        );

        return new WorkflowInstance($this->version, $payload, $this->solution['workspaceSid']);
    }