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[MCU] Wakandan Diplomacy

How did Wakanda maintain their secret at the international diplomatic level? We know they were involved with the UN. Did they not have regular diplomatic relations with other nations?

Where would/how could foreign diplomats live and work in Wakanda without noticing or suspecting anything? 

Wouldn't there be a need for (e.g. U.K. or U.S.) embassies and consulates in Wakanda?

Is there a "decoy" city outside the holographic forcefield, and if so, are there Wakandans who live there 24/7 who just play-act all day, every day, that Wakanda is poor and not advanced? If so are they paid government employees?
gpt
There is a decoy city, yes. . It seems their main strategy is looking like such a poor, reasource strapped nation that no-one has any real reason to have more then perfunctory relations with them. People will send the odd ambassador but they won't have any serious interaction. 

The question of who *lives* in that decoy city is, admittedly, a bit up in the air- even if only for keeping up apparences or sheer chance, some outsiders will stay there. Wakanda has good enough technology they might be able to make cheap human looking androids that it seems inhabitated on a passing glance, with diplomats acting as poverty stricken people being vistor's main interaction. Alternately, it might be a civil duty like Jury Duty- people sometimes have to go put on rags and sit in a decrepit city for a while. Presumably, they're compensated for their time.