Parsing custom_data in the callback

"custom_data": [
  {
    "keyof_customdata": "transaction_id",
    "valueof_customdata": "ART5A7044E5",
    "datecreation_customdata": "2026-05-09 07:20:23.362788"
  },
  {
    "keyof_customdata": "hash",
    "valueof_customdata": "f918c54d54cdc334ade09f8c228a224b1d3df646250c84dcdd99af528ddcd450",
    "datecreation_customdata": "2026-05-09 07:20:23.362788"
  },
  {
    "keyof_customdata": "logfile",
    "valueof_customdata": "2026050907202369fee03756652",
    "datecreation_customdata": "2026-05-09 07:20:23.362788"
  }
]

function getCustomValue(customData, key) {
  const entry = customData.find(e => e.keyof_customdata === key);
  return entry ? entry.valueof_customdata : null;
}

const transactionId = getCustomValue(payload.custom_data, 'transaction_id');

function getCustomValue(array $customData, string $key): ?string {
    foreach ($customData as $entry) {
        if ($entry['keyof_customdata'] === $key) {
            return $entry['valueof_customdata'];
        }
    }
    return null;
}

$transactionId = getCustomValue($payload['custom_data'], 'transaction_id');