这对我有用:

var url = "https://<YOUR_SHOP>.myshopify.com/admin/products.json";
var username = "<YOUR_SHOPIFY_API_KEY>";
var password = "<YOUR_SHOPIFY_API_PASSWORD>";
var response = UrlFetchApp.fetch(url, {"method":"get", "headers": {"Authorization": "Basic " + Utilities.base64Encode(username + ":" + password)}});