credit card to number ani aru iinformation match huncha ki hudai na, valid cha ki chaina; tyo sabai kam jun credit card company le issue gareko ho tehi company le garcha. For example a mastercard authenticity and funds avaliability is handled by mastercard in association with the bank, same for visa and other cards.

this authentication process is complex, therefore there are companies like CCbill, paypal who will do this authentication for you and charge you fees for their service. if you want to open a online business, and want to process credit cards, paypal is the best. ther are already lots of modules designed for paypal and is most widely used.

hope that helps...