You should be able to log in and find it, they probably previously sent you an email. Your going to need your port arrival form either printed out or online as they have to scan the qr code to check you in.
If you go to your online check in, at the top of the page there should be a link to your port arrival form with a QR code and your PAT. You can save it to your phone or print it, but do so because you can’t enter the port without it.
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