If you want to “play” with lndhub wallets without LN channels, use Lnbits (another app in Umbrel).
Here I wrote 2 guides about that:
Pay attention to details I wrote there:
- add the line in your lnd.conf file for circular payments
- use the sqlite database editor to edit and add “fictitious” funds in LNbits lndhub wallets.
Remember: the payments between these lnbits lndhub wallets will work ONLY between them, NOT with real world outside world. But for testing and fun can work.
Use Zeus or bluewallet mobile app to scan and import those lndhub wallets.