For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update/standard/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update.repo
zypper refresh
zypper install openssh
For SUSE SLE-15-SP5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update/SUSE_SLE-15-SP5/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update.repo
zypper refresh
zypper install openssh
For SUSE SLE-15-SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update/SUSE_SLE-15-SP4/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update.repo
zypper refresh
zypper install openssh