public function sendMessage($recipient, $subject, $body)
	{
		$token = $this->oauth->getToken();

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

		// Set the success response code.
		$this->oauth->setOption('success_code', 201);

		// Set the API base.
		$base = '/v1/people/~/mailbox';

		// Build the xml.
		$xml = '<mailbox-item>
				  <recipients>';

		if (is_array($recipient))
		{
			foreach ($recipient as $r)
			{
				$xml .= '<recipient>
							<person path="/people/' . $r . '"/>
						</recipient>';
			}
		}

		$xml .= '</recipients>
				 <subject>' . $subject . '</subject>
				 <body>' . $body . '</body>
				</mailbox-item>';

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

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

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

		return $response;
	}