微信退款通知 https://pay.weixin.qq.com/wiki/doc/api/wxpay/ch/pay/OfficialPayMent/chapter8_8.shtml 需要的pom <!-https://mvnrepository.com/artifact/commons-codec/commons-codec--> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> &...