function createFacebookData(){
var contents = [];
for(var i = 0; i < {{dlv - ecommerce.purchase.products}}.length; i++) {
  var product = {{dlv - ecommerce.purchase.products}}[i];
  var content = {"id": product["id"], "quantity": product["quantity"], "item_price": product["price"] };
  contents.push(content);
}
return contents}