I've found some questions heree looking similar, but solutions from them didn't work, so...
I call confluence API through Postman.
headers are OK, authorization basic and creds are right.
Hi @VADIM RAKU Welcome to the Atlassian Community!
Can you try below JSON body and see if that works for you
As 500 means "internal error" and as you tagged this as Server/DC instance - for these types of errors you would typically consult the applications logs (either if you have access to atlassian-confluence.log, or your admins). 500 roughly speaking should always be application-related errors, not that you would be supplying wrong parameters or payload. Almost, almost always there will be an error stacktrace thrown into the log with more details, when you happen to reproduce a 500.
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