For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Printing/openSUSE_Tumbleweed/Printing.repo
zypper refresh
zypper install cups-pdf
For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Printing/openSUSE_Leap_15.2/Printing.repo
zypper refresh
zypper install cups-pdf
For openSUSE Factory zSystems run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Printing/openSUSE_Factory_zSystems/Printing.repo
zypper refresh
zypper install cups-pdf