Get your passport, credit or debit card ready, and read the help document. A consent letter demonstrates that a child has permission to travel outside Canada from every parent or guardian who is not accompanying them on the trip.Eligible travelers submit their passport information and customs declaration form to CBP via a smartphone or tablet app before arrival. To whom it may concern,. Applying for an electronic travel authorization (ETA) tell us about yourself. First name(s) (also known as given name) (required) Applications for an eTA are solely made online. You must submit your application online to allow you to receive your electronic pass before you land in Canada.