Hi,

I’m working on a checkout flow in Commerce 14 where I need the order to be fully recalculated (prices, discounts, taxes, fees, shipping) right before the cart is converted into a PurchaseOrder.

Right now, I’m doing something like this:

var validation = _cartService.ValidateCart(cart);

if (!validation.IsSuccessful)
{
    // Handle errors
}

var purchaseOrder = _orderRepository.SaveAsPurchaseOrder(cart);
_orderRepository.Save(purchaseOrder);

It works most of the time, but I’ve noticed a few edge cases:

• If inventory changes during checkout

• If shipping address changes

• If customer-specific pricing is applied

• If promotions expire in between steps

…the totals on the final PurchaseOrder are sometimes slightly different from what the customer saw in the cart, and right now I am just showing payment sums not matched Error message on Website.

Is there a recommended way to force a full recalculation (pricing + taxes + promotions + shipping) right before SaveAsPurchaseOrder, with guaranteed consistency?

Should I be using:

• ICartPipeline.Run(...)?

• ICartService.RecalculateShipment(...)?

• ILineItemCalculator + IOrderFormCalculator manually?

• Or some end-to-end “checkout pipeline” pattern?

Looking for guidance on a clean, production-safe approach.

Thanks,

Sunil