Hii!
Sorry, but your question seems quite incomplete. You haven't mentioned or tagged the name of thr examination or the College or course for which you asked the question on payment issues. Kindly restructure your question and ask again inluding the necessary information.
Refresh the link once and try again. If the problem still persists,  you can contact the respective authorities and helpdesk and ask them about the same, since you have the email or the text message regarding the successful payment of fees. Quote the message kr receipt if required.
Hope you understand.
Good luck!