Question : credit card validation

my question is regarding credit card no. validation. I want to accept payment by credit card on my web site. I have bank merchant account (also know about secure certificate). I'm not using any shopping cart program. I developed my own asp page to choose prdoucts and place your order. My question is how can I validate credit card number? Any other web site, accecpting credit card validate the card number and what are other necessary informations are require? Is shooping cart is must or asp page developed by me will work ? Please cover all points and guide me.

Answer : credit card validation

Here is a card number validation script:

http://www.experts-exchange.com/Web/Web_Languages/ASP/Q_20162971.html

I use a modified version of this that I found a year back or so.  


ALSO:

If all you want to do is verify a CC# is a valid date and number then you can use this;

'******************************************************************
    'VERIFY CREDIT CARD DETAILS
'******************************************************************    
    ccmsg = ""
' check user's input to make sure
' something was entered for each input.
    If cctype <> "visa" And cctype <> "americanexpress" And cctype <> "mastercard" Then
         ccmsg=ccmsg & "You entered an unknown Credit Card.
"
    End If

    If Not(IsNumeric(ccnumber)) Or Not(Len(ccnumber) >= 13) then
         ccmsg=ccmsg & "You must enter a valid Credit Card number.
"
    end if

    'check the date
    if ccexpire="" or not(isdate(ccexpire)) then
         ccmsg=ccmsg & "You must enter a valid Expiration date.
"
    end if

    if ccmsg <> "" then
         response.redirect("payment.asp?ccmsg=" & Server.URLEncode(ccmsg))
    end if
%>

However if you want to ensure that a CC# is valid for processing then you will nned to use a CC processing center, there are dozens that do this, here is a brief list;

Authorize.Net
BluePay
CyberCash
DPI Merchant Services
ECX QuickCommerce 3.0
Epoch Systems
ePoint Processing
eProcessing Network
GoRealTime
iBill Processing
IntelliPay ExpertLink
IONGate
iTransact RediCharge
LinkPoint Secure
MCPS WebLink
NetBilling
PayCom Processing
Paymentech
PayReady Link
PaySystems (RevEcom)
Planet Payment
PSIGate
RTWare WebLink
SkipJack
Trust Ecommerce
2CheckOut
VeriSign PayFlow Pro
ViaKlix (Nova)
WorldPay