question

Hello. I'm trying to do function "Buy All Cars". The more cars the more requests. How can I optimize updating car data in my inventory?

handlers.BuyAllCars = function(args) {
    var inventory = server.GetUserInventory({PlayFabId: currentPlayerId}).Inventory;
    var carsCatalog = server.GetCatalogItems({CatalogVersion: "cars"}).Catalog;
    
    var inventoryCars = [];
    
    for(var i = 0; i < inventory.length; i++) {
        if(inventory[i].CatalogVersion != "cars") continue;
        
        inventoryCars.push(inventory[i]);
    }
    
    var buyCars = [];
    
    for(var i = 0; i < carsCatalog.length; i++) {
        var exist = false;
        
        for(var j = 0; j < inventoryCars.length; j++) {
            if(carsCatalog[i].ItemId == inventoryCars[j].ItemId) {
                exist = true;
                break;
            }
        }
        
        if(exist == true) continue;
        
        buyCars.push(carsCatalog[i].ItemId);
    }
    
    var grantItems = server.GrantItemsToUser(
    {
        CatalogVersion: "cars",
        PlayFabId: currentPlayerId,
        ItemIds: buyCars
    });
    
    for(var i = 0; i < carsCatalog.length; i++) {
        for(var j = 0; j < grantItems.ItemGrantResults.length; j++) {
            if(carsCatalog[i].ItemId != grantItems.ItemGrantResults[j].ItemId) continue;
            
            var unencodedData = JSON.parse(carsCatalog[i].CustomData);
            var newData = {};


            newData["engine"] = unencodedData.engine;
            newData["petrol"] = unencodedData.petrol;
            
            server.UpdateUserInventoryItemCustomData({
                Data: newData,
                ItemInstanceId: grantItems.ItemGrantResults[j].ItemInstanceId,
                PlayFabId: currentPlayerId
            });               
        }
    }
}