Dear Shwetha, as you haven't mentioned regarding which exam you are talking about, we shall provide you generic information. First off, if the confirmation page has not been generated, check if the money has been debited from your bank account. Also please check if you have received any notification at your registered Email or phone regarding the confirmation. Also check your Spam for the confirmation mail. Inspite of the money being debited but confirmation page not being generated, I would suggest you to wait for 24 hrs. Post that if you still dont receive the confirmation mail, you will have to make another payment and the first payment will be refunded. Before you make the payment please make sure that you clear the cookies, cache, etc.