code: def exchange_token(self, code):
          
          access_token_url = OAUTH_ROOT + '/access_token'
          params = {
              'client_id': self.client_id,
              'client_secret': self.client_secret,
              'redirect_uri': self.redirect_uri,
              'code': code,
          }
          resp = requests.get(access_token_url, params=params)
          if not resp.ok:
              raise MixcloudOauthError("Could not get access token.")
          return resp.json()['access_token']
docs: Exchange the authorization code for an access token.