Probably already exists. I know that there is contact management software that does similar tasks.
Perhaps that's the key: scan GitHub/SourceForge (is SF still around, anyway?) for an OSS base you can build this new app on. It has to exist already. The main challenge will then be selling it to restaurants.
Perhaps that's the key: scan GitHub/SourceForge (is SF still around, anyway?) for an OSS base you can build this new app on. It has to exist already. The main challenge will then be selling it to restaurants.