OH.  
if i want to sell credits on my site, and take a comission for the following workflow::

teacher wants to teach a class using my site instead of teachable.com, she needs to pay me a base fee for data storage / server, type stuff, each month, ideally in credits purchased through my site.

-her/his students will see and "buy" the teachers class in marketplace posting, and or subscribe to it, if it is a recurring fee.

--i want to set the exchange rate of the credits to 1.10 so each dollar bought i yield 10 cents comission.  

the other scenarios for use are as follows:

-user wants to sell something via marketplace, say, a bicycle.  and get the money in credits on the site, then "put withdrawl request" and they will convert their credits from selling the bicycle into real dollars and have that go into their bank.

-user wants to take more active role in supporting website costs (levels upgrade), they purchase via "upgrade" button on the dashboard.  as configured previously in paid levels.   is this subscription handled by what lives in stripe under settings > payment ,  versus marketplace, which is what is (ONLY????) handled by the stripe_connect module?  

i'm having difficulty sorting out the above scenarios/particulars,

and have read everything i've seen on site, and searched for.

meanwhile, i have been thinking out my intro for the "work with us" post, as I definitely have a solid interest.   

thanks Mark P (please advise.)