Create refund

Use the AdjustStoreCredit mutation to adjust store credit.
The amount can be a negative value and must be specified in the store's default currency (usually SEK).

Request:

mutation AdjustStoreCredit {
  adjustCustomerStoreCredit(input: {
    customerId: 12345,
    amount: 50.00,
    reason: "Refund for order #67890",
    orderId: 67890
  }) {
    amount
    success
  }
}

Response:

{
  "data": {
    "adjustCustomerStoreCredit": {
      "amount": 150.00,  //  amount after adjustment
      "success": true
    }
  }
}