Desky,
I am Reeve and acting Magistrate of the town of Foxbridge in Sedovia, and would be happy to help answer questions you may have. I am not a merchant, so I am not well versed in their methods, but Sedovia has a Merchant's Guild which monitors trade. All merchants trading for coin must be a part of the Merchant's Guild and abide by their rules. There are also a number of substances that are illegal to possess and trade within the boundaries of Sedovia.
While I do not have a copy of the Merchant's Guild charter, I do have a copy of Sedovian law. I will see if I am able to create a copy that can be shared in the dreaming here shortly.
I hope that assisted in answering some of your questions, and I look forward to meeting you if you travel to Foxbridge.
Safe travels to you,
Reeve Amory, acting Magistrate of Foxbridge