I would like to embed the terminal page into my site.

[Davidb]

Not for customers of course.  I just want to be able to go to mydomain/pay instead of squareup/terminal.   On a non-publiched page, so only I know the url, password and email needed to log in.  I would be the only person to log in and take cards over the phone.  I tried iframes but they dont work.

[VanKalkerFarms]

I'm not sure it can be embedded, and I'm not sure what going to a different URL is going to help when you can just bookmark https://squareup.com/terminal/ for ease of use.