So, as the title suggests, I have completed the Shopify 'Create App Tutorial' with React & NodeJS. What a week!
My app is embedded in my development site and NGROK is up & running.
For my first public app, I want to keep things simple: a popup notification for the front-end similar to SalesPop.
Backend is all sorted. I now feel comfortable in ReactJS & GraphQL, but, I have no idea how to inject my code into the client's front-end.
How do I do this?