For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:suop/openSUSE_Tumbleweed/home:suop.repo
zypper refresh
zypper install ntfy
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:suop/openSUSE_Slowroll/home:suop.repo
zypper refresh
zypper install ntfy
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:suop/16.0/home:suop.repo
zypper refresh
zypper install ntfy
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:suop/15.6/home:suop.repo
zypper refresh
zypper install ntfy