You will need to create a public Shopify App and submit it to the App Store.
There are a few tools and tutorials from Shopify that will really help you.
I've written few things about my first app here: https://sections.design/blogs/shopify/getting-into-app-store
Here is a great tutorial from Shopify: https://shopify.dev/tutorials/build-a-shopify-app-with-node-and-react
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