When you register for a Agent Capture Assist account you would have entered your first name, last name and an email address you can be contacted at for account notifications and billing.
To verify we have got a connection to your chosen email address the system will send you a 4 digit code by email that you will need to enter into the OTP pop up window.
Note: If you have entered your name and email details and submitted, but no pop up can be seen, check you do not have ad or pop up blockers enabled for the paytia.com site.