Merge pull request #456 from chjj/paypro_example

Add payment protocol example
11 years ago · b43b93c002
7 changed files with 972 additions and 1 deletions
--- a/examples/PayPro/bitcore.js
+++ b/examples/PayPro/bitcore.js
@ -0,0 +1 @@
+../../browser/bundle.js
--- a/examples/PayPro/customer.js
+++ b/examples/PayPro/customer.js
@ -0,0 +1,495 @@
+/**
+ * Payment-Customer - A Payment Protocol demonstration.
+ * This file will run in node or the browser.
+ * Copyright (c) 2014, BitPay
+ * https://github.com/bitpay/bitcore
+ */
+
+;(function() {
+
+/**
+ * Global
+ */
+
+var window = this;
+var global = this;
+
+/**
+ * Platform
+ */
+
+var isNode = !!(typeof process === 'object' && process && process.versions.node);
+
+// Disable strictSSL
+if (isNode) {
+  process.env['NODE_TLS_REJECT_UNAUTHORIZED'] = '0';
+}
+
+/**
+ * Dependencies
+ */
+
+var bitcore = isNode
+  ? require('../../')
+  : require('bitcore');
+var PayPro = bitcore.PayPro;
+var Transaction = bitcore.Transaction;
+var TransactionBuilder = bitcore.TransactionBuilder;
+
+/**
+ * Variables
+ */
+
+var port = 8080;
+
+if (isNode) {
+  var argv = require('optimist').argv;
+  if (argv.p || argv.port) {
+    port = +argv.p || +argv.port;
+  }
+} else {
+  port = +window.location.port || 443;
+}
+
+var merchant = isNode
+  ? parseMerchantURI(argv.m || argv.u || argv._[0])
+  : parseMerchantURI(window.merchantURI);
+
+/**
+ * Send Payment
+ */
+
+if (isNode) {
+  var Buffer = global.Buffer;
+} else {
+  var Buffer = function Buffer(data) {
+    var ab = new ArrayBuffer(data.length);
+    var view = new Uint8Array(ab);
+    data._size = data.length;
+    for (var i = 0; i < data._size; i++) {
+      view[i] = data[i];
+    }
+    if (!view.slice) {
+      // view.slice = ab.slice.bind(ab);
+      view.slice = function(start, end) {
+        if (end < 0) {
+          end = data._size + end;
+        }
+        data._size = end - start;
+        var ab = new ArrayBuffer(data._size);
+        var view = new Uint8Array(ab);
+        for (var i = 0, j = start; j < end; i++, j++) {
+          view[i] = data[j];
+        }
+        return view;
+      };
+    }
+    return view;
+  };
+  Buffer.byteLength = function(buf) {
+    var bytes = 0
+      , ch;
+
+    for (var i = 0; i < buf.length; i++) {
+      ch = buf.charCodeAt(i);
+      if (ch > 0xff) {
+        bytes += 2;
+      } else {
+        bytes++;
+      }
+    }
+
+    return bytes;
+  };
+}
+
+function request(options, callback) {
+  if (typeof options === 'string') {
+    options = { uri: options };
+  }
+
+  options.method = options.method || 'GET';
+  options.headers = options.headers || {};
+
+  if (!isNode) {
+    var xhr = new XMLHttpRequest();
+    xhr.open(options.method, options.uri, true);
+
+    Object.keys(options.headers).forEach(function(key) {
+      var val = options.headers[key];
+      if (key === 'Content-Length') return;
+      if (key === 'Content-Transfer-Encoding') return;
+      xhr.setRequestHeader(key, val);
+    });
+
+    // For older browsers:
+    // xhr.overrideMimeType('text/plain; charset=x-user-defined');
+
+    // Newer browsers:
+    xhr.responseType = 'arraybuffer';
+
+    xhr.onload = function(event) {
+      var response = xhr.response;
+      var buf = new Uint8Array(response);
+      return callback(null, xhr, buf);
+    };
+
+    if (options.body) {
+      xhr.send(options.body);
+    } else {
+      xhr.send(null);
+    }
+
+    return;
+  }
+
+  return require('request')(options, callback);
+}
+
+function sendPayment(msg, callback) {
+  if (arguments.length === 1) {
+    callback = msg;
+    msg = null;
+  }
+
+  return request({
+    method: 'POST',
+    uri: 'https://localhost:' + port + '/-/request',
+    headers: {
+      'Accept': PayPro.PAYMENT_REQUEST_CONTENT_TYPE
+        + ', ' + PayPro.PAYMENT_ACK_CONTENT_TYPE,
+      'Content-Type': 'application/octet-stream',
+      'Content-Length': 0
+    },
+    encoding: null
+  }, function(err, res, body) {
+    if (err) return callback(err);
+
+    body = PayPro.PaymentRequest.decode(body);
+
+    var pr = new PayPro();
+    pr = pr.makePaymentRequest(body);
+
+    var ver = pr.get('payment_details_version');
+    var pki_type = pr.get('pki_type');
+    var pki_data = pr.get('pki_data');
+    var details = pr.get('serialized_payment_details');
+    var sig = pr.get('signature');
+
+    // Verify Signature
+    var verified = pr.verify();
+
+    if (!verified) {
+      return callback(new Error('Server sent a bad signature.'));
+    }
+
+    details = PayPro.PaymentDetails.decode(details);
+    var pd = new PayPro();
+    pd = pd.makePaymentDetails(details);
+    var network = pd.get('network');
+    var outputs = pd.get('outputs');
+    var time = pd.get('time');
+    var expires = pd.get('expires');
+    var memo = pd.get('memo');
+    var payment_url = pd.get('payment_url');
+    var merchant_data = pd.get('merchant_data');
+
+    print('You are currently on this BTC network:');
+    print(network);
+    print('The server sent you a message:');
+    print(memo);
+
+    var refund_outputs = [];
+
+    var rpo = new PayPro();
+    rpo = rpo.makeOutput();
+    rpo.set('amount', 0);
+    rpo.set('script', new Buffer([
+      118, // OP_DUP
+      169, // OP_HASH160
+      76, // OP_PUSHDATA1
+      20, // number of bytes
+      0xcf,
+      0xbe,
+      0x41,
+      0xf4,
+      0xa5,
+      0x18,
+      0xed,
+      0xc2,
+      0x5a,
+      0xf7,
+      0x1b,
+      0xaf,
+      0xc7,
+      0x2f,
+      0xb6,
+      0x1b,
+      0xfc,
+      0xfc,
+      0x4f,
+      0xcd,
+      136, // OP_EQUALVERIFY
+      172  // OP_CHECKSIG
+    ]));
+
+    refund_outputs.push(rpo.message);
+
+    // We send this to the serve after receiving a PaymentRequest
+    var pay = new PayPro();
+    pay = pay.makePayment();
+    pay.set('merchant_data', merchant_data);
+    pay.set('transactions', [createTX()]);
+    pay.set('refund_to', refund_outputs);
+
+    msg = msg || 'Hi server, I would like to give you some money.';
+
+    if (isNode && argv.memo) {
+      msg = argv.memo;
+    }
+
+    pay.set('memo', msg);
+    pay = pay.serialize();
+
+    return request({
+      method: 'POST',
+      uri: payment_url,
+      headers: {
+        // BIP-71
+        'Accept': PayPro.PAYMENT_REQUEST_CONTENT_TYPE
+          + ', ' + PayPro.PAYMENT_ACK_CONTENT_TYPE,
+        'Content-Type': 'application/bitcoin-payment',
+        'Content-Length': pay.length + '',
+        'Content-Transfer-Encoding': 'binary'
+      },
+      body: pay,
+      encoding: null
+    }, function(err, res, body) {
+      if (err) return callback(err);
+      body = PayPro.PaymentACK.decode(body);
+      var ack = new PayPro();
+      ack = ack.makePaymentACK(body);
+      var payment = ack.get('payment');
+      var memo = ack.get('memo');
+      print('Our payment was acknowledged!');
+      print('Message from Merchant: %s', memo);
+      return callback();
+    });
+  });
+}
+
+/**
+ * Helpers
+ */
+
+// URI Spec
+// A backwards-compatible request:
+// bitcoin:mq7se9wy2egettFxPbmn99cK8v5AFq55Lx?amount=0.11&r=https://merchant.com/pay.php?h%3D2a8628fc2fbe
+// Non-backwards-compatible equivalent:
+// bitcoin:?r=https://merchant.com/pay.php?h%3D2a8628fc2fbe
+function parseMerchantURI(uri) {
+  uri = uri || 'bitcoin:?r=https://localhost:' + port + '/-/request';
+  var query, id;
+  if (uri.indexOf('bitcoin:') !== 0) {
+    throw new Error('Not a Bitcoin URI.');
+  }
+  if (~uri.indexOf(':?')) {
+    query = uri.split(':?')[1];
+  } else {
+    // Legacy URI
+    uri = uri.substring('bitcoin:'.length);
+    uri = uri.split('?');
+    id = uri[0];
+    query = uri[1];
+  }
+  query = parseQS(query);
+  if (!query.r) {
+    throw new Error('No uri.');
+  }
+  if (id) {
+    query.id = id;
+  }
+  return query;
+}
+
+function parseQS(query) {
+  var out = {};
+  var parts = query.split('&');
+  parts.forEach(function(part) {
+    var parts = part.split('=');
+    var key = parts[0];
+    var value = parts[1];
+    out[key] = value;
+  });
+  return out;
+}
+
+function createTX() {
+  // Addresses
+  var addrs = [
+    'mzTQ66VKcybz9BD1LAqEwMFp9NrBGS82sY',
+    'mmu9k3KzsDMEm9JxmJmZaLhovAoRKW3zr4',
+    'myqss64GNZuWuFyg5LTaoTCyWEpKH56Fgz'
+  ];
+
+  // Private keys in WIF format (see TransactionBuilder.js for other options)
+  var keys = [
+    'cVvr5YmWVAkVeZWAawd2djwXM4QvNuwMdCw1vFQZBM1SPFrtE8W8',
+    'cPyx1hXbe3cGQcHZbW3GNSshCYZCriidQ7afR2EBsV6ReiYhSkNF'
+    // 'cUB9quDzq1Bj7pocenmofzNQnb1wJNZ5V3cua6pWKzNL1eQtaDqQ'
+  ];
+
+  var unspent = [{
+    // http://blockexplorer.com/testnet/rawtx/1fcfe898cc2612f8b222bd3b4ac8d68bf95d43df8367b71978c184dea35bde22
+    'txid': '1fcfe898cc2612f8b222bd3b4ac8d68bf95d43df8367b71978c184dea35bde22',
+    'vout': 1,
+    'address': addrs[0],
+    'scriptPubKey': '76a94c14cfbe41f4a518edc25af71bafc72fb61bfcfc4fcd88ac',
+    'amount': 1.60000000,
+    'confirmations': 9
+  },
+
+  {
+    // http://blockexplorer.com/testnet/rawtx/0624c0c794447b0d2343ae3d20382983f41b915bb115a834419e679b2b13b804
+    'txid': '0624c0c794447b0d2343ae3d20382983f41b915bb115a834419e679b2b13b804',
+    'vout': 1,
+    'address': addrs[1],
+    'scriptPubKey': '76a94c14460376539c219c5e3274d86f16b40e806b37817688ac',
+    'amount': 1.60000000,
+    'confirmations': 9
+  }
+  ];
+
+  // define transaction output
+  var outs = [{
+    address: addrs[2],
+    amount: 0.00003000
+  }];
+
+  // set change address
+  var opts = {
+    remainderOut: {
+      address: addrs[0]
+    }
+  };
+
+  var tx = new TransactionBuilder(opts)
+    .setUnspent(unspent)
+    .setOutputs(outs)
+    .sign(keys)
+    .build();
+
+  print('');
+  print('Customer created transaction:');
+  print(tx.getStandardizedObject());
+  print('');
+
+  return tx.serialize();
+}
+
+/**
+ * Helpers
+ */
+
+function clientLog(args, isError) {
+  var log = document.getElementById('log');
+  var msg = args[0];
+  if (typeof msg !== 'string') {
+    msg = JSON.stringify(msg, null, 2);
+    if (isError) msg = '<span style="color:red;">' + msg + '</span>';
+    log.innerHTML += msg + '\n';
+    return;
+  }
+  var i = 0;
+  msg = msg.replace(/%[sdji]/g, function(ch) {
+    i++;
+    if (ch === 'j' || typeof args[i] !== 'string') {
+      return JSON.stringify(args[i]);
+    }
+    return args[i];
+  });
+  if (isError) msg = '<span style="color:red;">' + msg + '</span>';
+  log.innerHTML += msg + '\n';
+}
+
+function print() {
+  var args = Array.prototype.slice.call(arguments);
+  if (!isNode) {
+    return clientLog(args, false);
+  }
+  var util = require('util');
+  if (typeof args[0] !== 'string') {
+    args[0] = util.inspect(args[0], null, 20, true);
+    console.log('\x1b[32mCustomer:\x1b[m');
+    console.log(args[0]);
+    return;
+  }
+  if (!args[0]) return process.stdout.write('\n');
+  var msg = '\x1b[32mCustomer:\x1b[m '
+    + util.format.apply(util.format, args);
+  return process.stdout.write(msg + '\n');
+}
+
+function error() {
+  var args = Array.prototype.slice.call(arguments);
+  if (!isNode) {
+    return clientLog(args, true);
+  }
+  var util = require('util');
+  if (typeof args[0] !== 'string') {
+    args[0] = util.inspect(args[0], null, 20, true);
+    console.log('\x1b[32mCustomer:\x1b[m');
+    console.log(args[0]);
+    return;
+  }
+  if (!args[0]) return process.stderr.write('\n');
+  var msg = '\x1b[32mCustomer:\x1b[m \x1b[31m'
+    + util.format.apply(util.format, args) + '\x1b[m';
+  return process.stderr.write(msg + '\n');
+}
+
+/**
+ * Execute
+ */
+
+if (isNode) {
+  if (!module.parent) {
+    sendPayment(function(err) {
+      if (err) return error(err.message);
+      print('Payment sent successfully.');
+    });
+  } else {
+    var customer = sendPayment;
+    customer.sendPayment = sendPayment;
+    customer.print = print;
+    customer.error = error;
+    module.exports = customer;
+  }
+} else {
+  var customer = sendPayment;
+  customer.sendPayment = sendPayment;
+  customer.print = print;
+  customer.error = error;
+  window.customer = window.sendPayment = customer;
+  window.onload = function() {
+    var form = document.getElementsByTagName('form')[0];
+    var memo = document.querySelector('input[name="memo"]');
+    var loader = document.getElementById('load');
+    loader.style.display = 'none';
+    form.onsubmit = function() {
+      form.style.display = 'none';
+      loader.style.display = 'block';
+      form.onsubmit = function() { return false; };
+      customer.sendPayment(memo.value || null, function(err) {
+        loader.style.display = 'none';
+        if (err) return error(err.message);
+        print('Payment sent successfully.');
+      });
+      return false;
+    };
+  };
+}
+
+}).call(function() {
+  return this || (typeof window !== 'undefined' ? window : global);
+}());
--- a/examples/PayPro/index.html
+++ b/examples/PayPro/index.html
@ -0,0 +1,28 @@
+<!doctype html>
+<title>Payment Protocol</title>
+<link rel="stylesheet" href="/style.css">
+
+<h1>Payment Protocol</h1>
+
+<p>
+  <a href="https://github.com/bitcoin/bips/blob/master/bip-0070.mediawiki"><strong>BIP-70</strong></a>
+  is here!
+</p>
+
+<form method="POST" action="/-/request">
+  <ul>
+    <li>BitPay T-Shirt: <strong>0.00002000 BTC</strong></li>
+    <li>BitPay Mug: <strong>0.00001000 BTC</strong></li>
+  </ul>
+  <p>These items will cost you a total of <strong>0.00003000 BTC</strong>.</p>
+  <p>Would you like to checkout?</p>
+  <input type="text" name="memo" placeholder="Message to merchant..." value="">
+  <input type="submit" value="Checkout">
+</form>
+
+<p id="load">Loading...</p>
+
+<pre id="log"></pre>
+
+<script src="./bitcore.js"></script>
+<script src="./customer.js"></script>
--- a/examples/PayPro/index.js
+++ b/examples/PayPro/index.js
@ -0,0 +1,3 @@
+#!/usr/bin/env node
+
+module.exports = require('./server');
--- a/examples/PayPro/server.js
+++ b/examples/PayPro/server.js
@ -0,0 +1,375 @@
+#!/bin/bash
+
+/**
+ * Payment-Server - A Payment Protocol demonstration.
+ * Copyright (c) 2014, BitPay
+ * https://github.com/bitpay/bitcore
+ */
+
+/**
+ * Modules
+ */
+
+var https = require('https');
+var fs = require('fs');
+var path = require('path');
+var qs = require('querystring');
+var crypto = require('crypto');
+
+// Disable strictSSL
+process.env['NODE_TLS_REJECT_UNAUTHORIZED'] = '0';
+
+/**
+ * Dependencies
+ */
+
+var argv = require('optimist').argv;
+var express = require('express');
+var bitcore = require('../../');
+
+var PayPro = bitcore.PayPro;
+var Transaction = bitcore.Transaction;
+var TransactionBuilder = bitcore.TransactionBuilder;
+
+/**
+ * Variables
+ */
+
+var isNode = !argv.b && !argv.browser;
+
+var app = express();
+
+var x509 = {
+  priv: fs.readFileSync(__dirname + '/../../test/data/x509.key'),
+  pub: fs.readFileSync(__dirname + '/../../test/data/x509.pub'),
+  der: fs.readFileSync(__dirname + '/../../test/data/x509.der'),
+  pem: fs.readFileSync(__dirname + '/../../test/data/x509.crt')
+};
+
+var server = https.createServer({
+  key: fs.readFileSync(__dirname + '/../../test/data/x509.key'),
+  cert: fs.readFileSync(__dirname + '/../../test/data/x509.crt')
+});
+
+/**
+ * Ignore Cache Headers
+ * Allow CORS
+ * Accept Payments
+ */
+
+app.use(function(req, res, next) {
+  var setHeader = res.setHeader;
+
+  res.setHeader = function(name) {
+    switch (name) {
+      case 'Cache-Control':
+      case 'Last-Modified':
+      case 'ETag':
+        return;
+    }
+    return setHeader.apply(res, arguments);
+  };
+
+  res.setHeader('Access-Control-Allow-Origin', '*');
+
+  res.setHeader('Accept', PayPro.PAYMENT_CONTENT_TYPE);
+
+  return next();
+});
+
+/**
+ * Body Parser
+ */
+
+app.use('/-/pay', function(req, res, next) {
+  var buf = [];
+
+  req.on('error', function(err) {
+    error('Request Error: %s', err.message);
+    try {
+      req.socket.destroy();
+    } catch (e) {
+      ;
+    }
+  });
+
+  req.on('data', function(data) {
+    buf.push(data);
+  });
+
+  req.on('end', function(data) {
+    if (data) buf.push(data);
+    buf = Buffer.concat(buf, buf.length);
+    req.paymentData = buf;
+    return next();
+  })
+});
+
+/**
+ * Router
+ */
+
+// Not used in express 4.x
+// app.use(app.router);
+
+/**
+ * Receive "I want to pay"
+ */
+
+app.uid = 0;
+
+app.post('/-/request', function(req, res, next) {
+  print('Received payment "request" from %s.', req.socket.remoteAddress);
+
+  var outputs = [];
+
+  var po = new PayPro();
+  po = po.makeOutput();
+  // number of satoshis to be paid
+  po.set('amount', 0);
+  // a TxOut script where the payment should be sent. similar to OP_CHECKSIG
+  po.set('script', new Buffer([
+    118, // OP_DUP
+    169, // OP_HASH160
+    76,  // OP_PUSHDATA1
+    20,  // number of bytes
+    0xcf,
+    0xbe,
+    0x41,
+    0xf4,
+    0xa5,
+    0x18,
+    0xed,
+    0xc2,
+    0x5a,
+    0xf7,
+    0x1b,
+    0xaf,
+    0xc7,
+    0x2f,
+    0xb6,
+    0x1b,
+    0xfc,
+    0xfc,
+    0x4f,
+    0xcd,
+    136, // OP_EQUALVERIFY
+    172  // OP_CHECKSIG
+  ]));
+
+  outputs.push(po.message);
+
+  /**
+   * Payment Details
+   */
+
+  var mdata = new Buffer([0]);
+  app.uid++;
+  if (app.uid > 0xffff) {
+    throw new Error('UIDs bigger than 0xffff not supported.');
+  } else if (app.uid > 0xff) {
+    mdata = new Buffer([(app.uid >> 8) & 0xff, (app.uid >> 0) & 0xff])
+  } else {
+    mdata = new Buffer([0, app.uid])
+  }
+  var now = Date.now() / 1000 | 0;
+  var pd = new PayPro();
+  pd = pd.makePaymentDetails();
+  pd.set('network', 'test');
+  pd.set('outputs', outputs);
+  pd.set('time', now);
+  pd.set('expires', now * 60 * 60 * 24);
+  pd.set('memo', 'Hello, this is the server, we would like some money.');
+  var port = +req.headers.host.split(':')[1] || server.port;
+  pd.set('payment_url', 'https://localhost:' + port + '/-/pay');
+  pd.set('merchant_data', mdata);
+
+  /*
+   * PaymentRequest
+   */
+
+  var cr = new PayPro();
+  cr = cr.makeX509Certificates();
+  cr.set('certificate', [x509.der]);
+
+  // We send the PaymentRequest to the customer
+  var pr = new PayPro();
+  pr = pr.makePaymentRequest();
+  pr.set('payment_details_version', 1);
+  pr.set('pki_type', 'x509+sha256');
+  pr.set('pki_data', cr.serialize());
+  pr.set('serialized_payment_details', pd.serialize());
+  pr.sign(x509.priv);
+
+  pr = pr.serialize();
+
+  // BIP-71 - set the content-type
+  res.setHeader('Content-Type', PayPro.PAYMENT_REQUEST_CONTENT_TYPE);
+  res.setHeader('Content-Length', pr.length + '');
+  res.setHeader('Content-Transfer-Encoding', 'binary');
+
+  res.send(pr);
+});
+
+/**
+ * Receive Payment
+ */
+
+app.post('/-/pay', function(req, res, next) {
+  var body = req.paymentData;
+
+  body = PayPro.Payment.decode(body);
+
+  var pay = new PayPro();
+  pay = pay.makePayment(body);
+  var merchant_data = pay.get('merchant_data');
+  var transactions = pay.get('transactions');
+  var refund_to = pay.get('refund_to');
+  var memo = pay.get('memo');
+
+  print('Received payment from %s.', req.socket.remoteAddress);
+  print('Customer Message: %s', memo);
+  print('Payment Message:');
+  print(pay);
+
+  // We send this to the customer after receiving a Payment
+  // Then we propogate the transaction through bitcoin network
+  var ack = new PayPro();
+  ack = ack.makePaymentACK();
+  ack.set('payment', pay.message);
+  ack.set('memo', 'Thank you for your payment!');
+
+  ack = ack.serialize();
+
+  // BIP-71 - set the content-type
+  res.setHeader('Content-Type', PayPro.PAYMENT_ACK_CONTENT_TYPE);
+  res.setHeader('Content-Length', ack.length + '');
+  res.setHeader('Content-Transfer-Encoding', 'binary');
+
+  transactions = transactions.map(function(tx) {
+    tx.buffer = tx.buffer.slice(tx.offset, tx.limit);
+    var ptx = new bitcore.Transaction();
+    ptx.parse(tx.buffer);
+    return ptx;
+  });
+
+  (function retry() {
+    var timeout = setTimeout(function() {
+      if (conn) {
+        transactions.forEach(function(tx) {
+          var id = tx.getHash().toString('hex');
+          print('');
+          print('Sending transaction with txid: %s', id);
+          print(tx.getStandardizedObject());
+
+          var pending = 1;
+          peerman.on('ack', function listener() {
+            if (!--pending) {
+              peerman.removeListener('ack', listener);
+              clearTimeout(timeout);
+              print('Transaction sent to peer successfully.');
+            }
+          });
+
+          print('Broadcasting transaction...');
+          conn.sendTx(tx);
+        });
+      } else {
+        print('No BTC network connection. Retrying...');
+        conn = peerman.getActiveConnection();
+        retry();
+      }
+    }, 1000);
+  })();
+
+  res.send(ack);
+});
+
+/**
+ * Bitcoin
+ */
+
+var conn;
+
+var peerman = new bitcore.PeerManager({
+  network: 'testnet'
+});
+
+peerman.peerDiscovery = true;
+
+peerman.addPeer(new bitcore.Peer('testnet-seed.bitcoin.petertodd.org', 18333));
+peerman.addPeer(new bitcore.Peer('testnet-seed.bluematt.me', 18333));
+
+peerman.on('connect', function() {
+  conn = peerman.getActiveConnection();
+});
+
+peerman.start();
+
+/**
+ * File Access
+ */
+
+app.use(express.static(__dirname));
+
+/**
+ * Helpers
+ */
+
+var log = require('../../util/log');
+
+log.err = error;
+log.debug = error;
+log.info = print;
+
+var util = require('util');
+
+function print() {
+  var args = Array.prototype.slice.call(arguments);
+  if (typeof args[0] !== 'string') {
+    args[0] = util.inspect(args[0], null, 20, true);
+    console.log('\x1b[34mServer:\x1b[m');
+    console.log(args[0]);
+    return;
+  }
+  if (!args[0]) return process.stdout.write('\n');
+  var msg = '\x1b[34mServer:\x1b[m '
+    + util.format.apply(util.format, args);
+  return process.stdout.write(msg + '\n');
+}
+
+function error() {
+  var args = Array.prototype.slice.call(arguments);
+  if (typeof args[0] !== 'string') {
+    args[0] = util.inspect(args[0], null, 20, true);
+    console.log('\x1b[34mServer:\x1b[m');
+    console.log(args[0]);
+    return;
+  }
+  if (!args[0]) return process.stderr.write('\n');
+  var msg = '\x1b[34mServer:\x1b[m \x1b[31m'
+    + util.format.apply(util.format, args)
+    + '\x1b[m';
+  return process.stderr.write(msg + '\n');
+}
+
+/**
+ * Start Server
+ */
+
+server.on('request', app);
+server.app = app;
+server.port = +argv.p || +argv.port || 8080;
+
+if (!module.parent || path.basename(module.parent.filename) === 'index.js') {
+  server.listen(server.port, function(addr) {
+    if (!isNode) return;
+    var customer = require('./customer');
+    customer.sendPayment(function(err) {
+      if (err) return error(err.message);
+      customer.print('Payment sent successfully.');
+    });
+  });
+} else {
+  module.exports = server;
+}
--- a/examples/PayPro/style.css
+++ b/examples/PayPro/style.css
@ -0,0 +1,66 @@
+/**
+ * Stylesheet for Payment Protocol
+ */
+
+/**
+ * Raleway
+ */
+
+@font-face {
+  font-family: 'Raleway';
+  font-style: normal;
+  font-weight: 400;
+  src: local('Raleway'), url(http://themes.googleusercontent.com/static/fonts/raleway/v7/cIFypx4yrWPDz3zOxk7hIQLUuEpTyoUstqEm5AMlJo4.woff) format('woff');
+}
+
+/**
+ * Ubuntu
+ */
+
+@font-face {
+  font-family: 'Ubuntu';
+  font-style: normal;
+  font-weight: 400;
+  src: local('Ubuntu'), url(https://themes.googleusercontent.com/static/fonts/ubuntu/v5/lhhB5ZCwEkBRbHMSnYuKyA.ttf) format('truetype');
+}
+
+article, aside, details, figcaption, figure, footer, header, hgroup, nav, section, summary {
+	display: block
+}
+
+html {
+  width: 840px;
+  font-family: "Raleway", "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", "Helvetica", "Verdana", sans-serif;
+  font-size: 22px;
+  line-height: 30px;
+  -webkit-font-smoothing: antialiased;
+  text-rendering: optimizeLegibility;
+  color: #000;
+  background-image: -webkit-gradient( linear, 0 0, 0 100%, color-stop(0, rgba(0, 0, 0, 0.15)), color-stop(0.2, transparent), color-stop(0.8, transparent), color-stop(1, rgba(0, 0, 0, 0.15)));
+  background-image: -moz-linear-gradient( -90deg, rgba(0, 0, 0, 0.15) 0%, transparent 20%, transparent 80%, rgba(0, 0, 0, 0.15) 100%);
+  background-attachment: fixed;
+  background-color: #c1d3e3;
+}
+
+input {
+  display: block;
+  margin: 0 0 20px 0;
+  font-family: "Raleway", "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", "Helvetica", "Verdana", sans-serif;
+  font-size: 22px;
+  line-height: 30px;
+  -webkit-font-smoothing: antialiased;
+  text-rendering: optimizeLegibility;
+  color: #000;
+}
+
+body {
+  padding: 20px;
+  text-shadow: rgba(0, 0, 0, 0.025) 0 -1px 0, rgba(255, 255, 255, 0.2) 0 1px 0;
+}
+
+h1 {
+  width: 350px;
+  color: #000;
+  font: 60px/1.0 "Ubuntu", "Helvetica", "Verdana", "Arial", sans-serif;
+  margin-left: 20px;
+}
--- a/package.json
+++ b/package.json
@ -114,6 +114,9 @@
    "node": ">=0.10"
  },
  "devDependencies": {
-    "sinon": "^1.10.3"
+    "sinon": "^1.10.3",
+    "express": "4.6.1",
+    "request": "2.39.0",
+    "optimist": "0.6.1"
  }
 }