Op said need of credit card to validate the inscription
Do not understand ... I have to pay something to the site?
I want to do this task, but I have doubts in relation to task VALIDATION
The site requires a CC attached to paypal for it to validate your billing info. In exchange they give you $10 to use on their site.
They won't really charge you. 1$ charge will show up on your card and immediately will be refunded. That's how they verify.