this last year there was a lot of app in LG and Samsung. most of this are flix based and with a lot of bugs. some of these flix based are free or started as free and after a while asking for a licence.
i am going to avoid all these flix based apps and point with smarters but your iptv provider should have a dns registered in smarters website.
or there some very nice and cheapest app that with only 2€ smartone or duplecast 2,5€ that are very nice, specially if you are a reseller.
unfortunately duplex close the selling of activation code, but you can find in internet for about 5/6€ for 1 year activation.
no way to install apk from playstore o alternative store on these smart tv samsung or lg.