Refresh token example

Hi, I´m new in all these auth0 things.
I have an outdated token and want to call oauth/token but using refresh_token options.

Which headers should be added to the request? Also, which attributes should be listed in the body of the request?
I’ve been using just content-type for headers and next attributes for body:

  • client_id
  • client_secret
  • audience
  • grant_type
  • refresh_token
  • code

For now I have two paths that not sure which one should I follow:
if content-type uses application/json I received next message

On the other hand if content-type uses “application/x-www-form-urlencoded” next response is received

Another question, how could I get a proper value for code in body?