What do I need to have prepared for online check-in?

[Doingitagain]

I have taken a picture of my passport and it's very clear in showing everything that is necessary but I I'm wondering do I have to submit the picture at check-in vertically or horizontally. Unfortunately I have only been able to get all the information if taking it horizontally. I would really appreciate if somebody could tell me so I have everything ready to go.
Thank you in advance!

You should be fine. The biggest thing is to have the full bar code piece on the bottom so it uploads. If it doesn’t you will need to manually enter it. You could have a couple versions of the photos handy if one doesn’t fit. Remember…save and get through to get your PAT, then you can go back and fix uploads.