curl --request POST \
  --url https://api.loyalty.dog/v2/giftcards/programs/{programId}/cards/{cardId}/transactions/{transactionId}/refund \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 1,
  "reason": "<string>",
  "posTransactionId": "<string>"
}
'

{
  "transactionId": "5eb7cf5a86d9755df3a6c593",
  "giftCardId": "5eb7cf5a86d9755df3a6c593",
  "refundedAmount": "<string>",
  "remainingBalance": "<string>",
  "success": true,
  "message": "<string>"
}