Updating meta fields in Shopify with GrapQL
Solution 1:
I recommend you start using Postman, thunder client, or similar to write your graphql queries first, you will learn a lot about how graphql works and the error msgs will be a lot more useful.
To easily connect with Shopify on this stage, go to a store and create a private app, now you can use this for authenticating your API calls.
After that the Shopify graphql works on POST, you can't write your request on GET mode.