1. Get your passport, credit or debit card ready, and read the help document. When using U.S. preclearance facilities at a Canadian airport, you must meet U.S. entry requirements.Read these instructions carefully to properly complete this form. If you need more space to complete an answer, use a separate sheet of paper. In addition to your passport, you may need a travel authorization such as a visa or an Electronic Travel Authorization (eTA) to enter Canada. Unexpired foreign passport with an unexpired or expired. U.S. visa and unexpired I-94 or entry stamp. 2. Foreign passport. 4. Employment Authorization Document that contains a photograph (Form I-. 766). 5. Online Nonimmigrant Visa Application, Form DS-160 – Learn more about completing the DS-160.