How to load data from another server in shopify?

Question

JavaScript

How to load data from another server in shopify?

I need to download the number of stars from amazon.
I myself wrote a parser in php. now it remains to understand how
shopify can suck my script?

idea, like FB, VK and similar services.

host some js, and let it pick up data from a third-party script

, I don’t even know where to dig