I recently created a request in the Mapmaking Request subboard. And I must say that I'm astounded by the fast response to it, and the increasing number of applications.
However, comparing this site to others that sell services online through its members, I find this website lacking one important aspect. (Atleast I haven't found it yet, requesting directions if it exists).

There is no place to check the validity of a mapmaker, I'm not thinking in the form of there portfolio, as that is the applicants own responsibility. Instead, I'm thinking of the whole payment process, who delivers and who doesn't.
It would really be nice if there was a register somewhere that contained this kind of information.

My first thought was to simply utilize the "Finished Maps" section, and posting the map, the artist and using that to complete the checkout or as a receipt.
Especially, because the rules in that section dosn't disallow it, from what I've been able to read.