I just received an Apple ID code without request, what should I do?

There seem to be a lot of phishing attempts of this kind happening just now.

Scams (e-mail, text messages, and phone calls) are getting very good at closely imitating true Apple communications. Always be cautious. Here are some guidelines:

Identifying legitimate emails from the iTunes Store - http://support.apple.com/HT201679

Recognize and avoid phishing messages, phony support calls, and other scams - https://support.apple.com/HT204759

Apple 'How to identify, avoid, and report phishing' video--> https://youtu.be/SR3Z3fXXjfw

If you are uncertain about a message and a resource provided in that message, do not click on any links in the message. Try to independently verify the resource by going to a support page on apple.com and use that to contact Apple or to use the service the message is telling you to use.