Payments for Data Fields

I've always offered my data fields for free. But someone wanted me to create a field for them. And wants to charge for it.

Is there a HOW-TO guide on how to implement this? Potential users are global if that matters.

Also, I'm thinking it is easiest to publish the field from my store page. But I would want payments to be sent directly to the guy who commissioned the data field. I assume that is also possible.

This must be pretty straightforward since many CIQ apps are fee based - just have never done it.

Thanks!