curl --request POST \
  --url https://api.natural.co/wallet/withdraw \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --data '
{
  "data": {
    "attributes": {
      "amount": 12500,
      "currency": "USD",
      "externalFundingSourceId": "efs_550e8400e29b41d4a716446655440000",
      "description": "Payout transfer"
    }
  }
}
'

{
  "data": {
    "type": "withdrawal",
    "id": "txn_550e8400e29b41d4a716446655440000",
    "attributes": {
      "status": "PROCESSING",
      "amount": 12500,
      "currency": "USD",
      "instructionId": "ins_550e8400e29b41d4a716446655440000",
      "estimatedSettlement": "2026-01-06T15:30:00Z",
      "mfaRequired": false,
      "mfaChallengeId": null,
      "mfaExpiresAt": null,
      "error": null,
      "errorDetails": null
    }
  }
}