How to get alert from credit card transactions?

I have a small requirement that my customers are required to get an alert when thier credit cards are used as and when. Now I created an application that enrolls my customers willingness to get a alert when they purchase using their credit card. Now I need the credit card bureaus to inform me as soon as any transactions that happens. Is there any way to achieve this?|||contact the customer care executive of ur credit card provider|||That would have to be done through the creditor. They would have to set up some sort of alert. I receive e-mail alerts whenever a transaction is over a certain dollar amount. I set that up in my personal preferences. Each customer would have to do that.