Suzuki Dealer only.
It will need to be cut to fit the ignition, then coded into the ECU.
Some think you can give the dealers the key code and they can magic one out of their arse, but using the key code is correct, it'll take 6-10 weeks to be cut and shipped from Japan then still need to be coded into the ECU by the dealer.
Oh and be over £100 for the key where a black will be £30 and £2.5 to get cut.