How can I pay using PayPal?

If PayPal  as a Payment Option is offered for you on the booking page 

then 

  If you are already using  PayPal that your PayPal is assigned to your email and with your credit card. You can pay after clicking the "Save and continue" button. Then tap on the icon PayPal. You will go to the PayPal page from the booking page, please see the example below:

Sign in or use  Do not have a PayPal account.

After You may use credit card options or use a PayPal option

All useful questions and answers  https://en.intui.travel/faq/