I have recently started creating some basic Shopify custom apps and having difficulty understanding in creating a carrier service app. We have a shipping price service scripted in AWS which returns the price based on user zip code in real-time.
I did go through this documentation - https://shopify.dev/docs/admin-api/rest/reference/shipping-and-fulfillment/carrierservice but could not understand setting up the app inside a development store and how to add that app in the shipping price settings?
Is there a sample nodeJS, React app on Github that I can refer to?
Any help is appreciated.