public function flagPost($postId, $flag)
	{
		$token = $this->oauth->getToken();

		// Set parameters.
		$parameters = array(
			'oauth_token' => $token['key'],
		);

		// Set the success response code.
		$this->oauth->setOption('success_code', 204);

		// Set the API base
		$base = '/v1/posts/' . $postId . '/category/code';

		// Build xml.
		$xml = '<code>' . $flag . '</code>';

		// Build the request path.
		$path = $this->getOption('api.url') . $base;

		$header['Content-Type'] = 'text/xml';

		// Send the request.
		$response = $this->oauth->oauthRequest($path, 'PUT', $parameters, $xml, $header);

		return $response;
	}