I have solved the issue part of it is you can create webhooks for certain events inside shopify settings -> notifications -> add webhook and do it.
With the changes you might have to create multiple events and add same webhook.
https://github.com/gatsbyjs/store.gatsbyjs.org/issues/4
For blogs I have used Zapier since shopify lacks webhook functionality for that.
(when a new item is added to the rss feed. -> trigger a netlify deploy)
1. In Zapier, you can connect using the documentation as shopify generates rss feeds for blogs based on the category like news, events, press. (This will only work if your store is not using password so remove password on theme)
2. you don't have to provide credentials in just the json
Shopify automatically produces an RSS feed for every blog that you create, so customers can subscribe to it and receive notifications when you publish a new post. The feed URL is the URL of the blog page with .atom appended. For example, http://store.myshopify.com/blogs/blogname.atom
