public function create()
    {
        $this->data['mrkdwn_in'] = [];

        if ($this->markdownInText) {
            $this->data['mrkdwn_in'][] = 'text';
        }

        if ($this->markdownInPretext) {
            $this->data['mrkdwn_in'][] = 'pretext';
        }

        if ($this->markdownInFields) {
            $this->data['mrkdwn_in'][] = 'fields';
        }

        return Attachment::fromData($this->data);
    }