Sell the pro version of your Elixir / Erlang library on Code Code Ship. Code Code Ship integrates deeply with the hex package manager to provide the native Elixir / Erlang experience to your customers.
You'll be up and running in no time
1
Modify your mix.exs to publish to
hex.codecodeship.com
2
Publish with mix hex.publish
3
Your customers add
hex.codecodeship.com
as a hex repo