The real-world example is here:

in libraries/application.js

exports.dashboard = function(req,res){
  shopify.request({
    "method":"GET",
    "url":"/admin/shop.json",
    "shop":shop.name,
    "access_token":shop.access_token,
    "request": false,
  }
  ,function(error, response, data) {
    res.send(data);
  });
}
in libraries/shopify.js

exports.request = function(args,func){
  var request = require('request')
    , predefined = {
        method: args.method,
        url: "https://"+args.shop+args.url,
        headers:{'X-Shopify-Access-Token': args.access_token,},
        json: true,
      };
  request(predefined,func);
}