Install Flatpak
$ sudo zypper install flatpak
Add the Flathub repository
$ flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo $ flatpak remote-add --if-not-exists --user flathub https://flathub.org/repo/flathub.flatpakrepo
Restart
To complete setup, restart your system. Now all you have to do is install some apps!
Source: openSUSE Quick Setup
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