Disable shipping option callback

[rrandem]

Hi. I'm looking for a solution in using Prestashop Klarna Checkout Module (KCO) with Klarna Shipping Assistant (KSA). I'm trying to setup Klarna Checkout with KSA and everything works except that the Order total doesn't calculate the shipping fee.

Example, if the order is 100 NOK and the shipping is 99 NOK, the order total is still just 100 NOK when it should be 199 NOK.

Klarna explained the solution for me like this, but i don't know how to do this;
When you disable the shipping option callback, then the shipping costs and fees will be handled from Klarna, which means that you don't have to send the shipping costs to us in the orderlines callback. So if you disable this, you don't have to do anything regarding them. We recommend that you use this option since this means less errors with calculations, assignments, reflections on the iframe and so on.

Can anyone possibly help with this?