draftOrderCreate graphQL mutation failing suddenly

It seems I am experiencing the same problem when dealing with any mutation using GraphQL. Here the example of the code:

`mutation productCreate {
  productCreate(input: {title: "title"}) {
    product {
      id
    }
  }
}
`

example of the response: 
`{
    "errors": [
        {
            "message": "Field 'productCreate' doesn't exist on type 'Mutation'",
            "locations": [
                {
                    "line": 2,
                    "column": 3
                }
            ],
            "path": [
                "mutation productCreate",
                "productCreate"
            ],
            "extensions": {
                "code": "undefinedField",
                "typeName": "Mutation",
                "fieldName": "productCreate"
            }
        }
    ]
}`

It seems like there is some issue with the Shopify API and it doesn`t allow me to do any mutation.