I want the script of credit card authentication.So does any one have an idea from which site i can get this script ? or if any one have with you then please post me.
The last script that I was involved in writing to authorise credit card payments cost circa $30,000,000 so I am not sure I can really just give it away. To actually authorise credit cards directly is a massive undertaking requiring a lot of licenses however I assume what you are really asking for is a script to integrate with the a payment gateway in which case you need to specify which payment gateway it is you wish to use.
The first thing you have to have is a merchant account, you can usually do that through your bank. You next need to get a payment gateway, Authorize.Net is I believe the largest and usually everyone goes through them there are some other smaller ones like linkpoint, eprocessingnetwork etc... Here's a good review of the major ones http://www.merchant-account-services.org/article/payment-gateways-reviewed After you've done that you basically are just sending api messages back and forth in your application to verify the credit cards, they have response codes that tell you exactly what happened. We've developed a library that integrates with Authorize.Net and some others that we used, once you know the API it's really not that bad.