It is not true that Citibank asked me to send him a verification code when applying for a credit card. Because the verification code needs to be filled in by yourself, it is not true that Citibank requires me to send the verification code to it when applying for a credit card. Anyone online who asks you to send them a verification code is a scammer. Verification codes are a means to prevent scammers from maliciously cracking passwords, swiping tickets, flooding forums, and swiping pages.