https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=SECRET

生成最新的access_token，服务端接口调用wxacode.getUnlimited，返回4001

https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=ACCESS_TOKEN
{
    "access_token": "62_LvFpO3yCD7YCoaE99BKlBOvSfT_UaLXK67LSfYfhqjiWuybmlcPiU252HOAc7isIH4-xl3ngsGssTko5TbyU_MxAGhsotNuh7Syzu3VGXQtDmzFY4ejx3KV9-JJ5tqSc-qXIR8n_oiaIUrleUQNhAEAYUR",
    "env_version": "develop",
    "width": 230
}