The optional self-registration is followed from March 1 by a month-long collection of details by more than 120,000 enumerators using tablets and mobiles, which organisers say will make the process more accurate, transparent and credible.

Source: https://www.pakistantoday.com.pk/2023/03/06/bilawal-hints-at-parting-ways-if-centre-doesnt-address-reservations/

Visitors can still pay with cash or checks at the park by finding a ranger or following posted instructions, which could include using self-registration envelopes only if instructed to do so.

Source: https://gorgenewscenter.com/2023/12/30/visitors-can-book-same-day-online-reservations-statewide-starting-in-2024/