Ensure that refresh tokens are not requested simultaneously. This is especially important because if an access token is requested twice with the same refresh token, the second call returns that the refresh token is no longer valid. This will invalidate the entire authorization.
Ensure that refresh tokens are not requested simultaneously. This is especially important because if an access token is requested twice with the same refresh token, the second call returns that the refresh token is no longer valid. This will invalidate the entire authorization.