The shipping amount you see before order authorization is an estimate. The final amount is confirmed after your items reach the receiving location, are consolidated where applicable, and the parcel weight/dimensions or provider rate are known.
Automatic final-shipping charging is allowed only when final shipping does not exceed the USD estimate by more than the stricter of 15% or USD 10. Above that threshold, K-Shippify asks for separate approval or payment first.
Final-shipping approval does not have the same 48-hour expiry as goods approval. It can stay open until paid/approved or until storage closure, return, disposal, or support resolution closes the parcel.