When a payment is blocked, this is not a reflection of you or your account activities. Our internal security system is an automated system which reviews all of the details of every payment that is made through PayPal. It has been designed to recognise patterns that could result in buyer complaints, unauthorised claims or chargebacks. This is similar to the way your bank or credit card issuer approves transactions.
For fraud prevention reasons, I cannot see what aspect of this payment has caused our internal security system to intervene. Neither can I override or manually change the security settings to allow your payment to go through.
If your payment has been blocked you can:
Attempt to make the payment from a different card
Attempt to make the payment at a different time
Ensure that you are making your payment from your country of residence. If possible attempt to complete the payment from your home computer or the computer you most frequently use to access your PayPal account.
You may attempt to make USD your primary currency and see if the payment goes through.