Yeah, it's not the most documented repository. In the absence of that, you can check out the following document and implementation for some better understanding:

- https://github.com/OpenBazaar/openbazaar-go/blob/4a9ee8de8fd...

- https://github.com/OpenBazaar/openbazaar-go/blob/4a9ee8de8fd...

Hope that helps a bit. Keep in mind that none of this have been verified and might not work as advertised. Just a warning.