public IActionResult BuyProduct(Guid sessionId, int itemId)
{
ItemModel item = _itemService.GetItems()[itemId];
if (_purchaseService.CanAffordProduct(sessionId, itemId) < 0)
{
return(Json(new { CanAfford = false, DisplayText = String.Format("PRICE {0}", item.Price.ToString("C")) }));
}
double newCredit = _purchaseService.BuyProduct(sessionId, itemId);
return(Json(new { CanAfford = true, Balance = newCredit }));
}