Value MUST be set to "authorization_code".
Use "authorization_code", it is a static value
The authorization code received from the authorization server
If the "redirect_uri" parameter was included in the authorization request as described in Section 4.1.1, and their values MUST be identical.
"Basic" + " " + base64 encoded client_id:client_secret
Value MUST be set to "refresh_token"
Use "reresh_token", it is a static value
Generated by Odoo
Reusable within expiry.
See settings at ORESTAPI Applications
Reusable within expiry
Expires in 3600s (10x the access_token). Upon every successful access_token request a new refresh_token is generated, so the validity time is prolonged.