curl --request POST \
  --url https://api.ecrypt.com/v1/transactions/refund \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "transactionId": "<string>",
  "amount": 500000000,
  "initiatedByUserId": 123,
  "referenceTransactionId": 123
}
'

{
  "requestId": "000000000000000000000",
  "transactionId": "<string>",
  "authCode": "<string>",
  "responseCode": "<string>",
  "responseText": "<string>",
  "latency": 123,
  "avs": {
    "code": "<string>",
    "text": "<string>"
  },
  "cvv": {
    "code": "<string>",
    "text": "<string>"
  },
  "amount": 123,
  "metadata": {},
  "errors": [
    {
      "type": "<string>",
      "message": "<unknown>"
    }
  ]
}