My client has a subset of webstore items which have specific shipping costs associated with them. My current approach was to add a new line item via code when any of these items are selected and add the shipping as a service item line. This worked up to the point where I've added my service line to the cart using cart.addLine - but it won't let me set the amount - its defaulting to the $0 amount on the item record. (I am setting amount in my

cart.addLine

but it seems to be just ignoring that.) so 2 questions - 1. is there just a simpler way to do this and I shouldn't be doing this via SC extension code at all? 🙂 2. how can fix my existing code to set the price on the newly added line?

if(amount){
    cart.addLine({
        line: {
            quantity: 1,
            amount: amount,
            item: {
                internalid: 3420
            }
        }
    });
}

you'll either have to use Scriptable cart or have different items per rate

thanks, isn't Scriptable Cart generally a bad idea? or is that out dated thinking these days? 🙂

there is no other way to add variable amount items unfortunately.

frontend

So you are trusting the frontend to set the amount to be paid for shipping. That wouldn't be secure.

Fair point, I still need it to display to the customer before they confirm the order so they know what they're buying...

What i normally do is: • Orchestate the addition/substraction of complementary / add on items from server side • Send the amount as a transaction column field (that is set via server side, not via frontend) - this transaction column field is read by scriptable cart and set as rate. • Add additional integrity checks on the order to ensure addons are also added and removed together as a pair and amounts are correct.

yeah that makes total sense, thank you.