Node js blockchain bitcoin api

Question

So I want to use this: (taken from their API site -> node.js documentation) https://github.com/blockchain/api-v1-client-node

Receiving payments: https://github.com/blockchain/api-v1-client-node/blob/master/docs/Receive.md

var blockchain = require('blockchain.info');
var identifier = 'myidentifier';
var password = 'mypassword';
var myWallet = new blockchain.MyWallet(identifier, password);
var myBTCadress = '14Q3ufL1BUHtWskBKtsshVDATRY65TaJMB';

Ok, so the recieving part:

var receive = new blockchain.Receive( [confirmations: 1], ? );
//
What do I need to put here?

The documentation says: callbackURL: the url to which the callback should be sent (string)

I don't understand what URL should this go to. Any help will be appreciated.