diff --git a/source/packages/plg_system_mokosuitesupport/src/Helper/WebhookChannelHelper.php b/source/packages/plg_system_mokosuitesupport/src/Helper/WebhookChannelHelper.php
new file mode 100644
index 0000000..2f1c519
--- /dev/null
+++ b/source/packages/plg_system_mokosuitesupport/src/Helper/WebhookChannelHelper.php
@@ -0,0 +1,110 @@
+<?php
+namespace Moko\Plugin\System\MokoSuiteSupport\Helper;
+
+defined('_JEXEC') or die;
+
+use Joomla\CMS\Factory;
+use Joomla\Database\DatabaseInterface;
+
+/**
+ * Webhook channel handler — Facebook, Instagram, WhatsApp inbound message processing.
+ */
+class WebhookChannelHelper
+{
+	/**
+	 * Process an inbound Facebook Messenger webhook.
+	 */
+	public static function handleFacebook(array $payload, string $appSecret): object
+	{
+		// Verify signature is done at controller level
+
+		$results = ['processed' => 0, 'errors' => 0];
+
+		foreach ($payload['entry'] ?? [] as $entry) {
+			foreach ($entry['messaging'] ?? [] as $event) {
+				if (!isset($event['message'])) {
+					continue;
+				}
+
+				$senderId = $event['sender']['id'] ?? '';
+				$messageText = $event['message']['text'] ?? '';
+
+				if (empty($senderId) || empty($messageText)) {
+					continue;
+				}
+
+				$conversationId = self::findOrCreateConversation($senderId, 'facebook');
+				ConversationHelper::sendMessage($conversationId, $messageText, 'visitor');
+				AgentHelper::autoAssign($conversationId);
+
+				$results['processed']++;
+			}
+		}
+
+		return (object) $results;
+	}
+
+	/**
+	 * Process an inbound WhatsApp Cloud API webhook.
+	 */
+	public static function handleWhatsApp(array $payload): object
+	{
+		$results = ['processed' => 0, 'errors' => 0];
+
+		foreach ($payload['entry'] ?? [] as $entry) {
+			foreach ($entry['changes'] ?? [] as $change) {
+				$messages = $change['value']['messages'] ?? [];
+
+				foreach ($messages as $msg) {
+					$phone = $msg['from'] ?? '';
+					$text = $msg['text']['body'] ?? '';
+
+					if (empty($phone) || empty($text)) {
+						continue;
+					}
+
+					$conversationId = self::findOrCreateConversation($phone, 'whatsapp');
+					ConversationHelper::sendMessage($conversationId, $text, 'visitor');
+					AgentHelper::autoAssign($conversationId);
+
+					$results['processed']++;
+				}
+			}
+		}
+
+		return (object) $results;
+	}
+
+	/**
+	 * Find existing open conversation for a channel ID, or create a new one.
+	 */
+	private static function findOrCreateConversation(string $channelUserId, string $channel): int
+	{
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$db->setQuery($db->getQuery(true)
+			->select('id')
+			->from('#__mokosuitesupport_conversations')
+			->where('channel_user_id = ' . $db->quote($channelUserId))
+			->where($db->quoteName('channel') . ' = ' . $db->quote($channel))
+			->where($db->quoteName('status') . ' IN (' . $db->quote('open') . ',' . $db->quote('assigned') . ')')
+			->order('started_at DESC'), 0, 1);
+		$existingId = (int) $db->loadResult();
+
+		if ($existingId) {
+			return $existingId;
+		}
+
+		$result = ConversationHelper::create($channel, null, $channelUserId);
+		$convId = $result->conversation_id;
+
+		// Store channel user ID
+		$db->setQuery($db->getQuery(true)
+			->update('#__mokosuitesupport_conversations')
+			->set('channel_user_id = ' . $db->quote($channelUserId))
+			->where('id = ' . (int) $convId));
+		$db->execute();
+
+		return $convId;
+	}
+}