Node script that accepts wallet invitations and generates a Mnemonic backup for multisig Copay wallets

backup.js

var Client = require('bitcore-wallet-client');
var BWS_INSTANCE_URL = 'https://bws.bitpay.com/bws/api'

var secret = process.argv[2];

var client = new Client({
  baseUrl: BWS_INSTANCE_URL,
  verbose: false,
});

// Create a Mnemonic backup prase
client.seedFromRandomWithMnemonic('livenet');

// Join the wallet with name Backup key
client.joinWallet(secret,  "Backup Key", {}, function(err, wallet) {
  if(err) return;

  client.openWallet(function(err, ret) {
    if(err) return;
    succes(wallet);
  });
});

var succes = function(wallet) {
  console.log('You succesfully joined: ' + wallet.name + '!');
  console.log("Write down the following 12 word backup prase:\n");

  console.log(client.getMnemonic());
}

How it works:

$ npm install bitcore-wallet-client
$ node backup.js [wallet_invitation_code]

You succesfully joined: Holiday wallet!
Write down the following 12 word backup prase:
only salad elegant muscle shop badge cloud diesel search pair bright control