文档地址：https://pay.weixin.qq.com/wiki/doc/apiv3/wxpay/ecommerce/subsidies/chapter3_1.shtml

服务商发起补差：

api:https://api.mch.weixin.qq.com/v3/ecommerce/subsidies/create

微信请求补差 api 返回

{"code":"INVALID_REQUEST","message":"暂不支持调用此API"}