According to the api we can authorize the credit card. But in that process we have to put the amount and other information. What if i only want to validate a credit card not to charge it.
Actually i only want to verify whether the user is putting the correct credit card or not. because the system have to go through the hands of laymen.
You can't validate a credit card is legitimate without processing a transaction. You can validate the format of the card number is valid and the card is not expired, but not if it is real or active.
To validate a credit card is valid without charging it you need to do an AUTH_ONLY for either $0.00 or $0.01 depending on your processor's requirements. If it is approved, and the amount is $0.01, you should then void that transaction.
