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I suggest that you bring your suit in Norway. The contract was not formed until you signed it in Norway so you can take the position the contract was created there. I do not know Norwegian law on resolving conflicts of law but I would think you have a good chance of successfully arguing that Norwegian law applies and not CA law.
Under CA law, there late fee may be illegal is it bears no relationship to the administrative cost of being late. There is also a doctrine that some things are punitive in nature which could make both the late fee and the proposed 5% every 15 days unenforceable. It may also violate the CA usury law (usury is a pretty complex area in the US as it can depend on the nature of the business in which you are engaged.
BotXXXXX XXXXXne, file suit in Norway before they can file suit in CA and that will change the dynamic of your discussions with the other side.
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