Pakistan Tourist Visa is a document used by visitors to travel Pakistan for tourism purposes. E-Visa is an online method for applying. The advantage of Visas is that it can be applied quickly through the internet at any time. Payment is done online at the time of application.
Nowadays everything is online. The process is very easy if you have the right documents and you are living one of the countries that get Pakistan Visa Online.
1-You can apply as a new applicant if you don't have a valid Pakistani visa.
2-If may also apply for an extension to stay longer in Pakistan since you are already there.