Multi item shipping doesn't seem to work.

[spencerthayer]

I have a drop down with multiple options, sizes, separated in the hidden form as option_selectt$n. I can successfully pass the cost value to PayPal using MiniCart using a hidden option_amount$n form but I cannot pass a hidden shipping value. Each item has a unique shipping cost as the size are canvas which vary from eight inches to twenty-eight, the later being significantly more expensive.

How would I pass multiple shipping values to PayPal using MiniCart?

Note: <input type="hidden" value="<?=$itemShippingVaue;?>" name="shipping_<?=$n;?>"> does not work. Thank you.