code: function addProductToCart(url, productID, formID, formBuildID, formToken) {
  	let formdata = {
  		product_id: productID,
  		form_id: formID,
  		form_build_id: formBuildID,
  		form_token: formToken,
  		quantity: 1,
  		op: "Add to cart",
  	};
  	let headers = { "Content-Type": "application/x-www-form-urlencoded" };
  	let res = http.post(url, formdata, { headers: headers });
  	// verify add to cart succeeded
  	check(res, {
  		"add to cart succeeded": (res) => res.body.includes('Item successfully added to your cart')
  	}) || fail("add to cart failed");
  }
docs: Add a product to our shopping cart