For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/server:messaging/openSUSE_Factory_ARM/server:messaging.repo
zypper refresh
zypper install c-toxcore-daemon
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/server:messaging/openSUSE_Factory/server:messaging.repo
zypper refresh
zypper install c-toxcore-daemon
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/server:messaging/15.6/server:messaging.repo
zypper refresh
zypper install c-toxcore-daemon