Hi @kotmateusz , thanks for the explanations, but sorry it is still not entirely clear. We would like to use the live shipping plugin, because it would save us heaps of time in setting our shipping prices. But I think that for DDP shipping the price of shipping is the same as for non-DDP shipping. The only difference is that the carrier (UPS in this case) gets the customs duties bills and not the customer. I assume this needs to be mentioned on the label somewhere. So we actually would not need any changes to the pricing API, we just need to be able to print the lables so they say DDP and so that customs know to send UPS the bill for the customs duties (who will then bill us for that).
Is this possible with your live pricing plugin?