If you are looking at an enterprise-grade integration solutions, feel free to read about how we approach integration middleware solutions for Shopify clients here:
https://www.novicell.com/uk/latest-thinking/novicell-connectors-middleware-for-shopify/
or in Danish at https://www.novicell.com/dk/teknologier/shopify/shopify-tech-news/hvordan-integrerer-du-bedst-shopify-i-dit-systemlandskab/