For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/network:im:whatsapp/openSUSE_Tumbleweed/network:im:whatsapp.repo
zypper refresh
zypper install whatsie
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/network:im:whatsapp/openSUSE_Slowroll/network:im:whatsapp.repo
zypper refresh
zypper install whatsie
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/network:im:whatsapp/15.6/network:im:whatsapp.repo
zypper refresh
zypper install whatsie
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/network:im:whatsapp/15.5/network:im:whatsapp.repo
zypper refresh
zypper install whatsie