Connecting Netsuite, Shopify and a payment gateway

You don’t need to pay for any connector to connect to Shopify directly, you can just do it within Netsuite. Just create a private app in Shopify and you can call it within Netsuite. You can use Netsuite as the middle man if you want, that will give you the advantage of define schedules to run it in batches (if you do a scheduled script), or you could create a Restlet/Suitelet to serve as an API endpoint.

Here’s some code I posted on my website that will help you get started on getting this done in Suitescript 2.0, just make sure to replace HTTPSMODULE or load with the Netsuite https Module:

var SHOP_NAME = 'YOUR_SHOP_NAME';
var API_KEY = 'YOUR_API_KEY';
var PASSWORD_ACCESS_TOKEN = 'YOUR_PASSWORD_ACCESS_TOKEN';
var URLTEMPLATE = 'https://$APIKEY$:$PASSWORD$@$SHOP$.myshopify.com'
                .replace('$SHOP$', SHOP_NAME)
                .replace('$APIKEY$', API_KEY)
                .replace('$PASSWORD$', PASSWORD_ACCESS_TOKEN);

function run(){
    var myUrl = URLTEMPLATE;
    var path = '/admin/orders.json';
    myUrl += path;

    var orders = shopifyRequest(myUrl);
    var ordersJSON = JSON.parse(orders);
    return orders;
}

function shopifyRequest(myurl){
    var myrequest = {};
    myrequest.url = myurl;
    myrequest.method = HTTPSMODULE.Method.GET;
    myrequest.headers = {};
    myrequest.headers["X-Shopify-Access-Token"] = PASSWORD_ACCESS_TOKEN;
    var myresponse = HTTPSMODULE.request(myrequest);
    return myresponse.body;
}

Taken from:
Getting JSON from a Shopify Private App in Netsuite