Creating Google Accesstoken using Spring

Question

Hi guys am trying to get access token from google using Auth code from spring boot back-end.

But I get the same error response regardless any changes in developer console

com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 Forbidden
GET https://www.googleapis.com/drive/v3/files/appfolder
{
  "code" : 403,
  "errors" : [ {
    "domain" : "global",
    "message" : "Insufficient Permission: Request had insufficient authentication scopes.",
    "reason" : "insufficientPermissions"
  } ],
  "message" : "Insufficient Permission: Request had insufficient authentication scopes."
}

Here is my service class:

@Service
public class Google_Auth_service
{
    @Value("${auth.server.redirect.url}")
    private String redirectUrl;

    public String google_auth(String Auth_code) throws IOException {
        String CLIENT_SECRET_FILE = "/Users/narashimhaakannan/Downloads/auth_google/src/main/resources/client_secret.json";// json file directory, but it is in the parent folder
        String authCode=Auth_code;
        GoogleClientSecrets clientSecrets =
                GoogleClientSecrets.load(
                        JacksonFactory.getDefaultInstance(), new FileReader(CLIENT_SECRET_FILE));

        GoogleTokenResponse tokenResponse =
                new GoogleAuthorizationCodeTokenRequest(
                        new NetHttpTransport(),
                        JacksonFactory.getDefaultInstance(),
                        "https://oauth2.googleapis.com/token",
                        clientSecrets.getDetails().getClientId(),
                        clientSecrets.getDetails().getClientSecret(),
                        authCode,
                        redirectUrl)
                        .execute();
        String accessToken = tokenResponse.getAccessToken();
        String refreshToken = tokenResponse.getRefreshToken();
        String Expiry = String.valueOf(tokenResponse.getExpiresInSeconds());


        GoogleCredential credential = new GoogleCredential().setAccessToken(accessToken);
        Drive drive =
                new Drive.Builder(new NetHttpTransport(), JacksonFactory.getDefaultInstance(), credential)
                        .setApplicationName("Shankar IAS ")
                        .build();
        File file = drive.files().get("appfolder").execute();

        GoogleIdToken idToken = tokenResponse.parseIdToken();
        GoogleIdToken.Payload payload = idToken.getPayload();
        String userId = payload.getSubject();  // Use this value as a key to identify a user.
        String email = payload.getEmail();
        boolean emailVerified = Boolean.valueOf(payload.getEmailVerified());
        String name = (String) payload.get("name");
        String pictureUrl = (String) payload.get("picture");
        String locale = (String) payload.get("locale");
        String familyName = (String) payload.get("family_name");
        String givenName = (String) payload.get("given_name");



        return "{"
                + "    \"accessToken\": [{  \""+accessToken+"\"}],\r\n"
                + "    \"refreshToken\": [{  \""+refreshToken+"\"}],\r\n"
                + "    \"Token_Expires_in\": [{  \""+Expiry+"\"}],\r\n"
                + "    \"userId\":  [{ \""+userId+"\"}],\r\n"
                + "    \"email\":  [{ \""+email+"\"}],\r\n"
                + "    \"emailVerified\":  [{ \""+emailVerified+"\"}],\r\n"
                + "    \"name\":  [{ \""+name+"\"}],\r\n"
                + "    \"pictureUrl\":  [{ \""+pictureUrl+"\"}],\r\n"
                + "    \"locale\":  [{ \""+locale+"\"}],\r\n"
                + "    \"familyName\":  [{ \""+familyName+"\"}],\r\n"
                + "    \"givenName\":  [{ \""+givenName+"\"}],\r\n"
                + "}";
    }
}

Here is my controller:

@RestController
@RequestMapping("/api/auth")
public class google_auth_controller
{
    private final Google_Auth_service service;

    public google_auth_controller(Google_Auth_service service) {
        this.service = service;
    }

    @PostMapping("/google")
    public String google_auth_controller(@RequestParam String authcode)
    {
        try {
            return service.google_auth(authcode);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

I tried enabling the Google+ and added some scopes at OAuth consent screen, but I get the same error

How can I solve this!