For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fbosu:Office/openSUSE_Tumbleweed/home:fbosu:Office.repo
zypper refresh
zypper install homebank
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fbosu:Office/15.5/home:fbosu:Office.repo
zypper refresh
zypper install homebank
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fbosu:Office/15.4/home:fbosu:Office.repo
zypper refresh
zypper install homebank