need help in buying domain from godaddy.com using paypal for transaction.

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i want to buy a domain name, i selected godaddy.com becoz they were selling .info domains for only $0.99 & they are one of the most trusted on www. but i selected paypal for transaction, paypal asked me to give my credit or debit card number. but i dont any of these cards, but i had some funds in my paypal account. how should i use them without giving any card number. pls i want to register that domain before getting registered by other.