Hello, I'm getting ready to begin a project that will accept credit card payments online. I'm looking for any sample apps/tutorials that can guide me through making this web app as robust and secure as possible. A sample application similar to mine would be great if anyone knows of one available. Some topics that come to mind include: form input error handling, restricting access to pages until a user has logged in, what information should be logged to a database, pretty much just some basic web form best practices. Thanks.