How can skills be monetised by creators?

Obviously they are empowering Codex and Claude etc, and many will be open source or free.

But for those who have commercial resources or tools to add to the skills choice, is there documentation for doing that smoothly, or a pathway to it?

I can see at least a couple of ways it might be done - skills requiring API keys or or other authentication approaches, but this adds friction to an otherwise smooth skill integration process.

Having instead a transparent commission on usage sent to registered skill suppliers would be much cleaner but I'm not confident that would be offered fairly, and I've seen no guidance yet on plans in that regard.