As in title. Try to use graphQl API using this mutation https://help.shopify.com/en/api/graphql-admin-api/reference/mutation/ordereditaddvariant this error ...Error: Field 'orderEditAddVariant' doesn't exist on type 'Mutation'` seems that something is missing.
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Can you share the exact GraphQL query you are sending the to graphql endpoint, and also the endpoint's URL.
Anything related to order editing. Im even unable to start order editing by orderEditingBegin mutation. Error is the same
This is an accepted solution.
Can you try specifying an API version in that URL?
If you don't specify a version, you'll be served the oldest currently supported version, which is 2019-04.
Toggling through the version selector at the top of the orderEditBegin mutation docs, I can see that this mutation doesn't exist in the schema until 2020-01.
Can you swap your URL to http://greg-test-5.myshopify.com/admin/api/2020-01/graphql.json