Apply online for an eTA. You must be physically present in the United States when you file the Reentry Permit application and complete the biometrics services requirement.1. Get your passport, credit or debit card ready, and read the help document. Business and industry. At airports, train stations, and other transportation hubs you will need to present your original documents to establish your identity, so be prepared. In addition to your passport, you may need a travel authorization such as a visa or an Electronic Travel Authorization (eTA) to enter Canada. Carry a valid Canadian passport for all visits abroad, including visits to the US. It is the only universally accepted identification document. Review all information below to understand what documentation you will need to travel in and out of the US and how your travels may affect your visa status. You're also responsible for providing required documents to enter and travel through countries during your trip. This includes required visas.