The following links are good for how to create Shopify extension and for Send and get information from your APP databases
- https://www.shopify.com/in/partners/blog/checkout-ui-extensions
- https://community.shopify.com/c/extensions/issue-calling-shopify-app-api-from-checkout-ui-extension/td-p/2267439
- https://www.youtube.com/watch?v=wNdvxLzWUQg
- https://community.shopify.com/c/extensions/ui-checkout-send-options-extensions-request-to-server-network/m-p/2226100
- https://community.shopify.com/c/extensions/how-do-i-fetch-product-details-from-a-checkout-ui-extension/td-p/1671855
- https://www.youtube.com/watch?v=FDLoz__VKVk
- https://community.shopify.com/c/extensions/cors-issue-with-checkout-ui-extension-fetch-api-app-proxy/m-p/2025206
