Shimanocycle.com sounds like a scam out of the gate. Then asking for bank verification codes is like scammers paradise. There are more red flags than a a government rally in the Soviet Union.

Always go for Authorized Dealers you pay the correct amount for product but you get all the warranties and support for it and you have the satisfaction of knowing you have a legitimate product. You also are less likely to have any credit card issues and you aren't supporting scam artists and people making knockoffs.