How to refresh the access token?

[vidarl]

Hi

First, I would like to thank you for giving some code on how to get the access_token.

But upon retrial of the access_token, you also get an refresh token.
Any idea how to use that refresh_token to get a new access_token ( which will expire after 3 days) ?

I tried a bold move of sending a POST request to /yapi/o/token/ with post_data grant_type=refresh_token&refresh_token=[....], but that give response {"error": "invalid_client"}

I kinda assume the invalid_client error really means bad request....