Each time i try to download anything from itunes it says invalid security code

Question

each time i try to download from itunes it says invalid security code

Answer 1

This same issue bothered me for years. The account I had used to purchase iTunes songs with suddenly stopped working. And always it was the same error about the security code.
I talked to iTunes support, my bank and the eCommerce customer support for my Visa card. No one could ever tell me what it was until this year. I tried for years, literally years, to figure it out. I had to buy iTunes gift cards and that was not convenient for me. But thankfully, someone who worked in the credit department of a major online retailer, finally explained it to me.
Small banks, sometimes large banks, often don't opt to offer debit and credit cards that use Visa's stronger security, which is advertised as "Verified By Visa". Not all stores and online shops use this security method during their checkout process, but iTunes does. (Amazon, for example, does not require it)
So any error having to do with the security code means that Apple's iTunes shopping cart requires the stronger security method and does not accept the older 3-digit security code on the back of the regular Visa debit and credit cards. You would want to see which of your cards is supporting Verified By Visa security, and use one of those. The card you are currently using will never be accepted, no matter how many people tell you to carefully check your billing and account addresses and spelling, etc.
So get a Verified by Visa card, or use MasterCard.