curl --request POST \
  --url https://api.venlyfinance.com/v1/payment-requests/{paymentRequestId}/reversal \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "reason": "CUSTOMER_CANCELLATION",
  "description": "Customer requested cancellation",
  "idempotencyKey": "1b4e28ba-2fa1-11d2-883f-0016d3cca427"
}
'

{
  "success": true,
  "result": {
    "id": "d4e5f6a7-b8c9-4012-8345-6789abcdef01",
    "accountId": "b2a1f0e9-8c7d-4e3a-9f21-0a1b2c3d4e5f",
    "amount": {
      "fiat": 25,
      "crypto": "25.000000"
    },
    "currency": "USD",
    "status": "REVERSING",
    "reversalReason": "CUSTOMER_CANCELLATION",
    "reversalDescription": "Customer requested cancellation",
    "executions": [
      {
        "id": "b8c9d0e1-f2a3-4456-c789-abcdef012345",
        "walletPairId": "f6a7b8c9-d0e1-4234-a567-89abcdef0123",
        "type": "REVERSAL",
        "chain": "BASE",
        "asset": "USDC",
        "amount": 25,
        "exchangeRate": 1,
        "status": "PENDING",
        "createdAt": "2026-01-15T10:05:00Z",
        "updatedAt": "2026-01-15T10:05:00Z"
      }
    ],
    "createdAt": "2026-01-15T09:30:00Z",
    "updatedAt": "2026-01-15T10:05:00Z"
  }
}