Country access restriction how?

Hi everyone!

I want to know how do I restrict access people from one country and allowing the rest of the world to access the site?

I want to do something like this:

I offer same services to different countries, but I don't want people from one coutry to have access to the price that I offer to other people and vice-versa.

What should I do? How should I do? What information should I have?

Thanks!

 

 

 

 

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