So my NOWTV is built into my Samsung smart tv, so I dont use a stick or a box. I use the nowtv app on the smart tv.
So how do I order this?
The Samsung Smart televisions don't support the Sky Sports Box Office App.
Have you read this help article linked below on how to order & watch the Pay Per View Event (click the green arrows next to the FAQ to expand the on screen information) ?
You don't have to be a Sky Customer, where you need to register an account with Sky Sports Box Office and order & buy the fight directly through them.
The Sky Sports Box Office App can be downloaded from your smartphone App Store.
Also have a read of these FAQ taken from the Sky Sports Box Office website.
If the device is not listed on the FAQ then i doubt it is supported.
You would have to get in touch with Sky Sports Box Office for further assistance & help.
Never used the service myself, so i won't be able to offer much further help.
where it says:-
Don't have a NOW TV device? Watch through your PC, Mac, smartphone or tablet instead.
The point being that Sky Sports Box Office is an app, just as NowTV is an app.
So the Samsung NowTV app hasn’t got another app ‘inside it’, and it would need to be ‘alongside’ it , just like Netflix is, as the Samsung App Store also has this app.
Have you tried looking for the Sky Sports Box Office app in the Samsung App Store?