In this time, payment by using credit card done by theX many people. Many the shops sell its merchandise by using credit card. Not only in shops, expense through internet even also almost always his payment through credit card. Effect of progress of this technology, badness is even also start the storey.
Peoples start to exploit others credit card to do the payment a transaction. This clearly harm the people have the credit card.
In this time, payment by using credit card have to through otentication process. This process to prove that the credit card truely validate. Can also to know do his card is is blacked out or don't.
Otentication process this done by accessing the computer server from the credit card on-line. So thatly if the credit card have problem hence can direct known.
If expense us in internet and his payment by using credit card, usually we have to type number of credit card, name of owner of card, and date of lapsing. Typing of credit card number might possibly wrong, that good is intended and don't.
If happened mistake of typing [at] credit card number, it is of course process otentikasi to server become without effect. Transaction process surely will be refused, because the card number don't enlist at computer database server.
Clearly this will play around with the process. To avoid mistake at typist of credit card can be done by theX inspection of the card number.
How? All credit card numbers use the cheque digit. Of digit cheque this is, we can know what is enterred by theX credit card number correctness or wrong.


