The keys in this case are used for bluetooth comms locally between somebody's device and their bike.
These are ordinarily used by the VanMoof app to unlock the bike and control the bike's settings.
There are already some third-party apps (Moofer, Mooovy) to allow alternate access to those settings – including some hidden ones.
With a few tweaks those third-party apps should be able to support direct key upload, rather than having to log in and proxy authentication through to VanMoof's API.
These are ordinarily used by the VanMoof app to unlock the bike and control the bike's settings.
There are already some third-party apps (Moofer, Mooovy) to allow alternate access to those settings – including some hidden ones.
With a few tweaks those third-party apps should be able to support direct key upload, rather than having to log in and proxy authentication through to VanMoof's API.