code: func (wxa *MiniProgram) CreateWXAQRCode(coderParams QRCoder) (response []byte, err error) {
  	return wxa.fetchCode(createWXAQRCodeURL, coderParams)
  }
docs: // CreateWXAQRCode 获取小程序二维码，适用于需要的码数量较少的业务场景
  // 文档地址： https://developers.weixin.qq.com/miniprogram/dev/api/createWXAQRCode.html