get json on page checkout at shopify

Shopify Partner
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I want to get the data from `json` to `checkout.liquid`. And I get a CORS error:


has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource


And it's logical, I read that it should be done on the backend side. But I have a question:

Can I allow access to third party `json` by writing a script through a `script-editor`, in ruby language?


If so, please show a simple example, or point a resource to that example. I am not familiar with the ruby language.



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