I have pushed changes containing new return values and an IsRolePresent function to enable developers to create a basic permission system for their server.
Since currently there is no support for OAuth2 from Guilded, a connection like with Discord is not possible for the foreseeable future. More about it here:
A solution to this issue could be to create a system similar to what Transport Tycoon has: send a randomly generated code you get from in-game to your Guilded bot, which then connects your license to your Guilded ID, and stores it. If someone has the time and knowledge to create such a system, let me know!
Future updates will include examples that cover most of the available HTTP request methods as well as some interesting endpoints.