One-time in-app purchase

Hello, first of all, please excuse my English. I'm new to using Emby and I've seen on several sites that there is or was a way to buy the app for both Android and iOS for about $6. The thing is that I don't see any option on either iOS or Android to make a one-time payment for using the app. Have they removed this option and/or do they force you to subscribe to "Emby Premiere"? Is it no longer possible to buy the app on both Android and iOS?