I unmarked my solution: you have the aia and the blocks. 
A suggestion: as the algorithm is based on calculations only, use a java example and use the tool to create an extension. Is not difficult. 
If this is not correct, just look on Google..
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Yes extension would be good. Also they can try with some free api also
@Still-learning link provided is for EU countries only. Also this was just to show that many things can be done without extensions or use of an api.
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I really appreciate your time and response and kindness on my topic, you helped me a lot to orient myself and to continue. I thank you again.
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