Dear candidate, sometimes payment page do not appear or payment fails but application gets filled successfully due to some technical glitch. In such cases the money gets refunded within 7-10 days. It is advised to check your payment status on the official website. If it’s “OK”, then well and good, take out the print out of the confirmation page. However, if it’s not OK, then go to the official website and pay the fees. It is mandatory, else it will create problems in future. For more information, you can check:

https://engineering.careers360.com/articles/how-to-fill-jee-main-application-form

Hope, it helps!