We use Klarna Checkout with our Magento webshop. For this plugin, we want the following changes:
1. The first time a customer visit the checkout page, we want the following shipping method to be selected: "Levert med Bring - Inngangsdør gateplan (hverdag 8-16), kr 698,00".
2. If that shipping method is not available. No shipping method should be selected (shipping method will be blank).
3. No action on the checkout page should affect shipping method. For instance, if you increase or decrease quantity, or change your address, shipping method should not be changed. Shipping method should only be changed by customers selection.
4. Customer should not be able to complete the order without selecting a shipping method (validation of shipping method form).
5. This issue should be solved by PHP, and not jQuery. Please be aware of step 3 of the checkout process which is an iframe.