Can i buy Disney e-tickets?

Yes

Yes, we did it through the app and it worked flawless. You just link thr tickets to your app and they scan them at the gate.

Yes you can

Yes. And the Max Pass is totally worth it. You can buy tickets online or the app but make sure you link your ticket to the app and it makes things so much easier to manage everything. Have fun!

Yes, on their website

I'm not sure. You probably can