mapdev\FacebookMessenger\Callback\Attachment::__construct PHP Method

    public function __construct($attachment)
    {
        $this->type = Helper::array_find($attachment, 'type');
        $this->isImage = $this->type == 'image';
        $this->isAudio = $this->type == 'audio';
        $this->isVideo = $this->type == 'video';
        $this->isFile = $this->type == 'file';
        $this->isLocation = $this->type == 'location';
        $this->isTemplate = $this->type == 'template';
        $this->isFallback = $this->type == 'fallback';
        if ($this->isImage || $this->isAudio || $this->isVideo || $this->isFile) {
            $this->url = Helper::array_find($attachment, 'payload.url');
        }
        if ($this->isLocation) {
            $this->location = Helper::array_find($attachment, 'payload.coordinates');
            $this->title = Helper::array_find($attachment, 'title');
            $this->url = Helper::array_find($attachment, 'url');
        }
        if ($this->isTemplate) {
            $this->template_type = Helper::array_find($attachment, 'payload.template_type');
            //TODO
            //need to access SendAPI object to get options
        }
        if ($this->isFallback) {
            $this->title = Helper::array_find($attachment, 'title');
            $this->url = Helper::array_find($attachment, 'url');
            $this->payload = Helper::array_find($attachment, 'payload');
            //not sure what the output is here?
        }
    }