public function update() {

			
			$provider = $this->GetProvider();
			
			$existingAccessToken = new League\OAuth2\Client\Token\AccessToken(
				json_decode($this->ReadAttributeString("Token"), true) 
			);
			
			$this->SendDebug('Expired in', date("Y-m-d\TH:i:s",$existingAccessToken->getExpires()), 0);
			$this->SendDebug('refresh_token', $existingAccessToken->getRefreshToken(), 0);
//			if ($existingAccessToken->hasExpired()) {
			$newAccessToken = $provider->getAccessToken('refresh_token', [
			'refresh_token' => $existingAccessToken->getRefreshToken()
    		]);
			$this->SendDebug('newrefresh_token', $newAccessToken->getRefreshToken(), 0);
//			
			$this->WriteAttributeString("Token", json_encode($newAccessToken));
			$this->SendDebug('new Access Token', $newAccessToken->getToken(), 0);
//			}
    // Purge old access token and store new access token to your data store.
//		}
	}