Wechat's refund returns "the accepting institution must be transferred to sub_mch_id".

when Wechat returns a refund,
the xml
< xml > < return_code > returned by sub_mch_id
must be passed into
< xml > < return_code > < / return_code >
< return_msg > < / return_msg >
< / xml >
excuse me, is there such a situation and how to solve it?

Wechat-developed WeChat-Pay java

Aug.12,2021

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WeChat Pay after the success of the callback function has not been completed, the user exited the page, how to solve?
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