公众号第三方平台授权次数限制
公众号给第三方平台授权时，提示第三平台授权达到上限
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公众号给第三方平台授权时，提示第三平台授权达到上限
access_token写入缓存
获取access_token确实有频率限制（一天是2000次，有效期7200s），目前知道的方法是做缓存，设置有效期，等过期了再重新获取。
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