计算access_token签名
appid:
secret:
timestamp:
nonce:
signature:
{{accesstoken_signature}}
计算用户登录签名
uid:
token:
timestamp:
nonce:
signature:
{{login_signature}}
计算接收图文或接收图片文件接口的签名
uid:
access_token:
timestamp:
signature:
{{api_signature}}