I was trying to pay an order that lead me to this site for payment, and everything went well until I put in the credit card number. It said something like “card number can’t be verified” or something similar.

I’m from Finland and using mastercard. I contacted my bank, but they didn’t know why wouldn’t it work.

What could be the problem?

Also, it seems that 2CO is the only re-seller of the product I was about to buy, and I really need that product. So, please, help me.