There is no late fees per se but there are registration slabs for different delegate application rounds, which have a minimal fees increment per round so as to help us accommodate the people who register later on.
You can pay your fees using Paypal at the time of application. If you're an Indian Delegate, you can also pay your fees using UPI, the details of which you'll find in your payment tab of the dashboard. For further payment related queries, connect with us at firstname.lastname@example.org.
If you need a visa to attend the conference, after making the payments, do let us know about the same and send us a scanned copy of your passport, after which we'll send you an official invitation letter for visa purposes. You can also contact us at email@example.com.