app := goshopee.App{
		PartnerID:  133456,
		PartnerKey: "xxxxxxxxx",
		APIURL:     "https://xxxxx",
		RedirectURL: "https://yourdomain/usercallback",
	}

	client := goshopee.NewClient(app, goshopee.WithRetry(3), goshopee.WithLogger(NewLogger()))

  // auth url
  authUrl, err := client.Auth.GetAuthURL()

  // fetch access token
  // code from https://yourdomain/usercallback?code=xxxxx&shop_id=123456
  res, err: client.Auth.GetAccessToken(sid, 0, code)
  tok:=res.AccessToken

  // fetch shop info
  client.Shop.GetShopInfo(sid, tok)