code: function snsConfirmHandler() {
  	return (req, res, next) => {
  		// Handle call for SNS confirmation
  		// @see http://docs.aws.amazon.com/sns/latest/dg/SendMessageToHttp.html
  		if (req.headers['x-amz-sns-message-type'] === 'SubscriptionConfirmation') {
  			const subscribeUrl = req.body.SubscribeURL;
  			debug(`Received SubscriptionConfirmation request: ${subscribeUrl}`);
  
  			return request({ uri: subscribeUrl }, (err, response, body) => {
  				if (err) {
  					return res.status(400).send({error: err.message});
  				}
  
  				// Parse the response and extract the subscription ARN
  				const parser = new xml2js.Parser();
  				return parser.parseString(body, function callback(err, doc) {
  					if (err) {
  						return res.status(400).send({error: err.message});
  					}
  
  					let subscriptionArn;
  					try {
  						subscriptionArn = doc.ConfirmSubscriptionResponse.ConfirmSubscriptionResult[0].SubscriptionArn[0];
  						if (!subscriptionArn) {
  							return res.status(400).send({ error: 'Cannot find SubscriptionArn' });
  						}
  						debug(`Subscription: ${subscriptionArn}`);
  					} catch (e) {
  						// Ignore errors related to accessing the value
  						return res.status(400).send({ error: 'Cannot find SubscriptionArn' });
  					}
  
  					// Retain the subscription ARN on the request for testing
  					res.subscriptionArn = subscriptionArn;
  					return res.send('Subscribed');
  				});
  			});
  		} else {
  			return next();
  		}
  	};
  }
docs: Middleware to handle SNS subscription confirmations
  
  @returns