gistfile1.txt

# fetch the event, all its tickets and each batch of each ticket
  node(node_type: EVENT id:X) {
    ...on Event {
      tickets {
        nodes {
          batches {
            nodes {
              price
              committed_count
              sold_count
            }
          }
        }
     }
    }
  }

graphiql-mutation.js

mutation createDiscount($input:  CreateTicketDiscountCouponInput!) {
  create_ticket_discount_coupon(input: $input) {
  	... on TicketDiscountCoupon {
      id
      code
      created_at
    }
    ... on ValidationErrors {
      errors
    }
  }
}

// query variables
{
  "input": {
    "event_id": "9a62df05-062d-41fe-bbe2-98634485f88e",
    "code": "xwololo50",
    "total_available": 1,
    "discount_percentage": 1,
    "discount_cents": 1
  }
}