How can I make amazon affiliate account on different regions

I made amazon aff account of US and was doing good. Then I joined the UK and Canada program too without any problem. But I see a lots of traffic on my sites are also from other regions too like
Australia
Mexico
Brazil and many others.

But these countries are not allowing to create amazon affiliate if I am from a different country. They are asking for local pin code of their respective country. So how can I get commission from those countries?

I also subscribed for Genius link but it seems like it of no use if I cant create account for respective region.

What should I do?

How do I sign up for all the regions?

Plz help

Can someone shed some light here ?

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