in Wechat"s payment callback, after I successfully processed it, I directly
return "success"
Wechat reported an error
error example:
transaction_id=4200000217201810305986075380] > < / return_code > < return_msg > < / return_msg > < / xml >]
I change it to xml format and return
return sprintf ("< xml > < return_code > < / return_code > < return_msg > < / return_msg > < / xml >");
Wechat still reported an error
transaction_id=4200000221201810316667479789] > < / return_code > < return_msg > < return_code > < / return_code > < return_msg > < / return_msg > < / xml >]] > < / return_msg > < / xml >]
how to solve