For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/system:snappy/openSUSE_Tumbleweed/system:snappy.repo
zypper refresh
zypper install snapd
For openSUSE Factory zSystems run the following as root:
zypper addrepo https://download.opensuse.org/repositories/system:snappy/openSUSE_Factory_zSystems/system:snappy.repo
zypper refresh
zypper install snapd
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/system:snappy/openSUSE_Factory/system:snappy.repo
zypper refresh
zypper install snapd