AddEventHandler("currency", "OnCurrencyRateUpdate", "CurrencyUpdate");
function CurrencyUpdate()
{
CModule::IncludeModule('iblock');
CModule::IncludeModule('catalog');
CModule::IncludeModule('currency');
$rsGroup = \Bitrix\Catalog\GroupTable::getList();
while($arGroup=$rsGroup->fetch())
{
print_r($arGroup);
}
}