CS list of product refId

redIf.js

function() {
  var productIds;
  
  function productsCSV(){
    $.ajax({
      method: 'GET',
      url:'/api/checkout/pub/orders/order-group/'+{{ORDER ID}},
      async: false
    }).then(function(resp){ 
      productIds = resp[0].items.map(function(product){ return product.refId }).join(',');
    })
  }
  productsCSV();
  
  return productIds;
}