Countless? I just counted 1 attempt from your IP, and that was only after my reply
I looked in to it, and you entered your billing address fine, but the card issuer refused the payment as "possibly fraudulent", which it does after comparing your IP, your address, your details, and the country you are purchasing from (the UK) to the details provided etc. - there can be any number of reasons for it returning "fraud suspicion" on a purchase, including the volume of fraud payments from that area/address/IP/country (perhaps Bulgaria has a higher fraud rate than most), to your bank having "high security" meaning it automatically refuses payments you try to make to other countries (to try and protect you from your card being stolen). You might want to look in to "Verified By Visa" - WorldPay supports this, and it's a way of securing your card and thus guaranteeing payments are successful on your card. This is available to visa credit cards. Mastercard also do similar with "Mastercard securecode". You can contact your bank/card supplier if you want to set this up (though most do it automatically for you the first time you try to buy with those cards online).
Note that this doesn't mean you'd always have this problem purchasing everywhere - different payment sites have different security levels - meaning some can accept payments from just about anyone, anywhere, anytime - they simply charge the merchants (eg me) much more for each purchase, or charge the merchant everytime there's a chargeback, so the merchants suffer in the end whenever
is a fraud purchase anytime. I prefer to stick to sites with good fraud systems
You can try contacting your card issuer (which is likely your bank) and they can actually check that you attempted a payment, and can tell you why it went wrong (if it's the bank that refused it), otherwise you can contact WorldPay.
Alternatively you could just try sorting your PayPal account out - PayPal's much more widely supported than "MoneyBookers", has better fraud prevention systems, and is better for me.
To set up a moneybookers merchant account too, I would start losing a lot more money - the more merchant accounts I setup, the more income is spread through each site - the less money going through each site, the higher the charges on
every transaction I am charged!