curl --request POST \
  --url 'https://api.stateset.com/api/v1/gift-cards/{id}/refund' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "amount": "string",
  "reference_id": null
}'

{
  "amount": "string",
  "balance_after": "string",
  "created_at": "2026-07-24T12:00:00Z",
  "gift_card_id": "string",
  "id": "string",
  "reference_id": null,
  "transaction_type": "string"
}