Getting an Access Token
The code received in the successful response of the authorization can be exchanged for an access token, with a token request to the token_endpoint specified in the metadata document.
For example:
POST https://appname.scienceconnect.io/api/oauth/token 
Content-Type: application/x-www-form-urlencoded
client_id=appname
code=PogGjLoPEZ49i7E1DXY_jyteE1inZ7Udv