Authorization denied

Friends, I do not understand anything at all.

After libsyn a week ago, I could not get money from my credit card through PayPal, it began to be strange. Actually, it all started with PayPal. No foreign service can receive payment authorization on any of my cards.

I use four cards for such purposes: three master cards and one visa. Banks are different: Alfa-Bank, Finansbank and Raiffeisen. That is, not Kryzhopltrastinvestpromsvyazkommertsbank, but decent large banks. At the same time, they all refuse to make online payments. Alfa-Bank explained to me that CVC (Card Verification Code - there are three digits on the back of the card) does not come along with other payment information, which is why payments cannot be authorized.
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There are several questions in this connection:

1) Is it just me?
2) If this phenomenon is massive, then where did his legs grow from?
3) If you have payments abroad for credit cards pass - what are your banks and card types? (relevant for payments made in the last week)
4) What to do?