For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:buschmann23:nextcloud/openSUSE_Tumbleweed/home:buschmann23:nextcloud.repo
zypper refresh
zypper install nextcloud-notify-push
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:buschmann23:nextcloud/openSUSE_Slowroll/home:buschmann23:nextcloud.repo
zypper refresh
zypper install nextcloud-notify-push
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:buschmann23:nextcloud/16.0/home:buschmann23:nextcloud.repo
zypper refresh
zypper install nextcloud-notify-push
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:buschmann23:nextcloud/15.6/home:buschmann23:nextcloud.repo
zypper refresh
zypper install nextcloud-notify-push