curl --request POST \
  --url https://api.headlesscommerce.io/v1/admin/orders/{id}/refunds \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "reason": "<string>",
  "amount": 123,
  "restock": true,
  "lines": [
    {
      "order_line_id": "<string>",
      "quantity": 2
    }
  ]
}
'

{
  "id": "<string>",
  "order_id": "<string>",
  "amount": {
    "amount": 123,
    "currency": "<string>"
  },
  "reason": "<string>",
  "restock": true,
  "lines": [
    {
      "order_line_id": "<string>",
      "quantity": 123
    }
  ],
  "created_at": "2023-11-07T05:31:56Z"
}