References

1. https://github.com/Shopify/shopify-app-examples/tree/main/qr-code/node
2. https://github.com/Shopify/shopify-app-template-node
3. https://gadget.dev/blog/shopify-post-purchase-extension-upsell-tutorial
4. https://www.smoothcode.io
5. https://www.reddit.com/r/shopify/search/?q=app%20pain&restrict_sr=1&sr_nsfw=