I would like to design/write an app that mimics the basic functionality of the e-commerce website. The app would be free to install for anyone, preferably compatible with all android & iphone devices. As a result, any smart phone user could download the app for free, and purchase a product off of the e-commerce website. I do not require the app to be added to Shopify's app store, but would like to install it to Google Play Store.
Can I use GraphQL to do this? Or is that only for Shopifys app store? Also, I am assuming this needs to be made a public app and not a private app?
If GraphQL cannot be used, are there any other recommendations?