Developer API
Sending a message:

Discord.Backend.API:Send(
    Discord.OOP:New('Message'):SetChannel('Relay'):SetEmbed({
        color = 0xe74c3c,
        description = 'hello world',
    }):ToAPI()
)


Properties of Message class:

Message:SetChannel(string Channel) -- Sets the channel the message should be sent to (Channel should exist in the config)
Message:SetRaw(table Data) - Accepts the raw format for Discord messages, more here: https://discordapp.com/developers/docs/resources/channel#create-message
Message:SetMessage(string Message) -- Sets the message's contents
Message:SetEmbed(table EmbedData) -- Accepts the raw format for Discord embed, more here: https://discordapp.com/developers/docs/resources/channel#embed-object
Message:ToAPI() -- Returns sendable format for my backend


Creating own commands: (Execution of commands currently restricted only to Relay and Admin channel)

Discord:RegisterCommand('command', function(data)
    print('command was ran from discord!')
end)


Discord:RegisterCommand(string Command, function Callback) -- Registers new command that can be executed from Discord. Callback has one argument which returns the command data. More info below.


Command data:

{
    raw = '!command test "argument 2"', -- Raw output of the message invoking the command
    channel = 'Relay', -- Channel name the command was ran in - matches the ones in discord_config.lua
    command = 'command', -- The command name ran
    argstr = 'test "argument 2"', -- Raw argument string received
    author = {
        id = '150542592172490752', -- Discord User ID of the command invoker
        roles = { -- All roles of the command invoker in the guild
            {
                id = '544087135020515339', -- Discord Role ID
                name = 'Admin', -- Discord Role Name
                position = 5, -- Discord Role Position from the Discord API
                calculatedPosition = 7, -- Discord Role Position in the Discord Role Manager
                permissions = 8, -- Discord Permissions Bitfield of the role permissions (https://discordapp.com/developers/docs/topics/permissions)
            },
            ...
        },
        hoistRole = '544087135020515339', -- The ID of the highest role the user has, if none - then it is the Guild ID
        nickname = 'Trixter', -- The visible name of the command invoker in the Discord guild
    },
}


Hooks

Discord_Backend_Connected() -- Called when the realm has successfully connected to the Backend
Discord_ShouldRelay(player Ply, string Text, any Team) -- Return false to prevent the message from being relayed to Discord
Discord_ParseText(string Text, player Ply) -- Return formatted text that should be relayed to Discord
Discord_ParseTeam(any Team) -- Return if the PlayerSay team variable actually means that the message is in team chat (some addons use the team variable for indicating different states of the message)