Two things here. First:
https://github.com/discourse-league/discourse-league/commit/d008ce2ef386174000de98b7bb28acc385494a43
This means there is no longer a need for a license key on this and it is formally open to the public. 
That said, would someone on the team be willing to move this to #plugin?
Second, I did get the trust level setting added:
https://github.com/discourse-league/discourse-league/commit/f6fb75d16725a3a4f159205e8cafc98016a4ffdd
I’m currently working on a rebrand of this and the addition of tests. The plan is to get this into a state such that it would be accessible to hosted instances on the Enterprise level. At least, that’s the hope. 
EDIT: I also just deployed a test instance that uses a sandbox gateway. So no money actually passes hands. You can get details in the OP here.