POST https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=ACCESS_TOKEN

调用接口的参数：{"width":200,"auto_color":true,"page":"pages/personals/single_groups2/index","scene":"eb7806e748f2ce9d"}

接口返回：{“errcode”:-1,“errmsg”:“system error hint: [xvYI0a04101091]”}