Carrier Calculated shipping rate not showing at checkout page

Retired Boards Appdev Shopify Apis And Technology
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1

I am developing Custom Carrier APP for my client’s shipping company. I am using REST api to develop app to add new carrier and adding Public Post API as a callback url. I have added my carrier from settings> Shipping and delivery>General Shipping rage> Add rate. Now it is showing under “Carrier and App rate”.

But when I am trying to checkout, Under shipping method, It is showing only “Standard” package. It’s not showing any method from “Carrier and App rate”. If I delete “standard” package from settings, checkout page showing "Shipping not available. How can I debug and solve the issue?

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2

Make sure your app is returning a shipping rate array in the correct Shopify format. You can test this by sending shipping request payload JSON to your callback url and checking the response.

3

How can I send shipping request payload JSON?