Adding new GraphQL client to ShopifyAPI module.

shopify_api_graphql_client.rb

require 'that_graphql_client'

module ShopifyAPI
  class GraphQLClient < GraphQLClient
    SHOPIFY_GRAPHQL_ENDPOINT_TEMPLATE = "https://<MYSHOPIFY_DOMAIN>/admin/api/graphql.json"
  
    def initialize(**args)
      raise(ArgumentError, 'Must provide an shop as an argument') unless args[:shop].present?
    
      super.tap do |client|
        client.site = SHOPIFY_GRAPHQL_ENDPOINT_TEMPLATE.sub('<MYSHOPIFY_DOMAIN>', args[:shop].shopify_domain)
        client.headers.merge!({'X-Shopify-Access-Token' => args[:shop].shopify_token})
      end
    end
  end
end