Filling out the form by entering your passport, travel and personal details
Authorization payment is to be made by Visa or Mastercard once the application form has been submitted
During the proccesing procedure personal data will be checked and verified in order to approve or decline authorization. Reply will be sent within 72 hours of submission of the application
Once you have received your electronic authorization, it will be sent as well to the CBP (US Customs and Border Protection), whereby you will have to print and present your authorization at the check-in at the airport