You buy an osbot voucher, which is Osbot credit.
With that credit you can buy scripts in the store
Didn't get the level to test it, might be able to lend me one for a sec?
Enjoy the trial
It's a client issue atm ... devs are aware of it.
EDIT:
Script updated to V1.20:
Made a small work around to fix the banking until the devs fix the issue.
Will be online in a few hours!