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1.文档
服务端: https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/customer-message/customerServiceMessage.getTempMedia.html
button: https://developers.weixin.qq.com/miniprogram/dev/component/button.html
指南 :https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/customer-message/customer-message.html