callmez\wechat\sdk\Wechat::init PHP Method

    public function init()
    {
        if ($this->appId === null) {
            throw new InvalidConfigException('The appId property must be set.');
        } elseif ($this->appSecret === null) {
            throw new InvalidConfigException('The appSecret property must be set.');
        } elseif ($this->token === null) {
            throw new InvalidConfigException('The token property must be set.');
        }
    }