Q: Itunes not accepting security code on credit card

Is the address on your iTunes account exactly the same (format and spacing etc) as on your credit card bill : http://support.apple.com/kb/TS1646 ? If it is then you could try what it says at the bottom of that page :

If the issue persists, contact your credit card company and verify that they and any company they use to process credit card authorizations have the correct information on file.

And/or try contacting iTunes support : http://www.apple.com/support/itunes/contact/

Contacting itunes support is like trying to contact God. Just ain't happening, guy. All I can tell you is to double check that there isn't any discrepancies. If worse comes to worse, just go buy yourself some itunes gift cards and use those.

I have the same issue and have re entered my card and still says invalid pin.

It just started to happen to me. Had same credit card being used with iTunes for over 3 years. Today, when updating apps, it asked to verify financial info, specifically the security code. And now it's not accepting it anymore. Realy annoying....

Any luck anyone on fixing this ?????

Leo