The URL of the payment request your server created.
OptionalshippingShipping config to add to the payment request when it was created without one,
such as the payment request returned when an authorization results in
STEP_UP_REQUIRED, which cannot carry a shipping config. Ignored when the payment
request already has a shipping config.
Hands Klarna a payment request your server created, for example the one returned when an authorization results in
STEP_UP_REQUIRED.