Adding TRP3 'full names' to UI target frame

[Joker119]

Title says it all, I want to add TRP3's last names (when applicable) to my target frame's name, however, I'm not entierly sure how to do this.

I started by simply trying to replace the default name with the one supplied by the TRP chatframe functions, but it just shows blank, no errors, just no name either.

oUF.Tags.Methods["diablo:name"] = function(unit)
    local color = oUF.Tags.Methods["diablo:color"](unit)
    if IsAddOnLoaded("Totalrp3") then
        local UnitID = TRP3_API.utils.str.getUnitID(unit)
        local name = TRP3_API.chat.getFullnameForUnitUsingChatMethod(UnitID)
    else 
        local name = UnitName(unit)
    end
    return "|cff"..color..(name or "").."|r"
end

I've based the UnitID local off what I've gathered going through trp's code. for example: the chatframe.lua never generates the UnitID, but uses it, thus it must come from a global function.
Looking in register_main.lua I fine the mouseover function for tooltips:

local function onMouseOver(...)
    local unitID, unitRealm = getUnitID("mouseover");
    if unitID and isUnitIDKnown(unitID) then
        local _, race = UnitRace("mouseover");
        local _, class, _ = UnitClass("mouseover");
        local englishFaction = UnitFactionGroup("mouseover");
        saveCharacterInformation(unitID, race, class, UnitSex("mouseover"), englishFaction, time(), buildZoneText(), GetGuildInfo("mouseover"));
    end
end

which tells me UnitID comes from 'getUnitID', which is a local import of 'utils.str.getUnidID', the utils are globally declared as "TRP3_API.utils" in the utils.lua file, which also has this function in it:

function Utils.str.getUnitID(unit)
    local playerName, realm = UnitFullName(unit);
    if not playerName or playerName:len() == 0 or playerName == UNKNOWNOBJECT then
        return nil;
    end
    if not realm then
        realm = Globals.player_realm_id;
    end
    return playerName .. "-" .. realm;
end

From this, I can gather feeding a unit into "TRP3_API.utils.str.getUnitID()" should get me the UnitID I require for the next function "TRP3_API.chat.getFullnameForUnitUsingChatMethod(UnitID)"

However, upon doing this, I get no character name.
I also get no errors, so I know i'm calling the right functions with the right information, I'm just not getting back anything.

I found another function aswell

function TRP3_API.register.getUnitRPName(targetType)
    local unitName = UnitName(targetType);
    local unitID = getUnitID(targetType);
    return getUnitRPNameWithID(unitID, unitName);
end
 
TRP3_API.r.name = TRP3_API.register.getUnitRPName;

However setting name = TRP3_API.r.name or TRP3_API.register.getUnitRPName also, gives me no name to display.

I'm utterly confused by all of this, tbh :S