curl --request POST \
  --url https://api-sandbox.y.uno/v1/payments/{payment_id}/transactions/{transaction_id}/cancel-or-refund \
  --header 'Content-Type: application/json' \
  --header 'X-Idempotency-Key: <x-idempotency-key>' \
  --data '
{
  "merchant_reference": "<string>",
  "description": "<string>",
  "reason": "DUPLICATE"
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "status": "<string>",
  "type": "PURCHASE",
  "amount": {
    "currency": "<string>",
    "value": 123
  },
  "created_at": "2023-11-07T05:31:56Z"
}