Добавим новое дело в таймлайн сделки email

$subject = '[Ticket#: 11111111111111111111]';
$description = "Test";
$entity_type = 'DEAL';
$entity_id = 731;
$responsible = 1;
$now = \ConvertTimeStamp(time() + \CTimeZone::GetOffset(), 'FULL', 's1');
$arBindings[] = array(
    'OWNER_TYPE_ID' => \CCrmOwnerType::ResolveID($entity_type),
    'OWNER_ID' => $entity_id
);
$arFields = array(
    'OWNER_ID' => $entity_id,
    'OWNER_TYPE_ID' => \CCrmOwnerType::ResolveID($entity_type),
    'TYPE_ID' =>  \CCrmActivityType::Email,
    'SUBJECT' => $subject,
    'START_TIME' => $now,
    'END_TIME' => $now,
    'COMPLETED' => 'Y',
    'RESPONSIBLE_ID' => $responsible,
    'PRIORITY' => \CCrmActivityPriority::Medium,
    'DESCRIPTION' => $description,
    'DESCRIPTION_TYPE' => \CCrmContentType::Html,
    'DIRECTION' => \CCrmActivityDirection::Incoming,
    'LOCATION' => '',
    'NOTIFY_TYPE' => \CCrmActivityNotifyType::None,
    'BINDINGS' => array_values($arBindings),
    'STORAGE_TYPE_ID' => $storage,//Для вложений
    'STORAGE_ELEMENT_IDS' => $storageID,
    'COMMUNICATIONS' => [["VALUE"=>$userEmail,"ENTITY_ID"=>$contactID,"ENTITY_TYPE_ID"=>3]]//привязка к контакту
);

$test = \CCrmActivity::Add($arFields, false, false, array('REGISTER_SONET_EVENT' => true));