WhatsApp Webhook

Lightweight WhatsApp Cloud API webhook parser. Typed notifications for messages, statuses, and errors. HMAC signature verification. Zero dependencies.

Author: Renzo Johnson

Requirements

• PHP 8.4 or higher (uses readonly classes and enums)
• ext-json
• No other extensions or libraries required (zero dependencies)

Installation

composer require renzojohnson/whatsapp-webhook

Quick Start

use RenzoJohnson\WhatsAppWebhook\WebhookHandler;
use RenzoJohnson\WhatsAppWebhook\MessageType;
use RenzoJohnson\WhatsAppWebhook\Notification\MessageNotification;

$handler = new WebhookHandler('your-app-secret');

// Register listeners
$handler->onMessage(MessageType::Text, function (MessageNotification $msg): void {
    echo "Message from {$msg->from}: {$msg->text()}";
});

// Verify signature and handle
$rawBody = file_get_contents('php://input');
$signature = $_SERVER['HTTP_X_HUB_SIGNATURE_256'] ?? '';

if (!$handler->verifySignature($rawBody, $signature)) {
    http_response_code(401);
    exit;
}

$handler->handle($rawBody);
http_response_code(200);

Webhook Endpoint Setup

use RenzoJohnson\WhatsAppWebhook\WebhookHandler;
use RenzoJohnson\WhatsAppWebhook\WebhookException;

$handler = new WebhookHandler('your-app-secret');

// Step 1: Handle Meta's verification challenge (GET)
if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    $challenge = $handler->handleVerification($_GET, 'your-verify-token');

    if ($challenge !== null) {
        echo $challenge;
        exit;
    }

    http_response_code(403);
    exit;
}

// Step 2: Verify signature (POST)
$rawBody = file_get_contents('php://input');
$signature = $_SERVER['HTTP_X_HUB_SIGNATURE_256'] ?? '';

if (!$handler->verifySignature($rawBody, $signature)) {
    http_response_code(401);
    exit;
}

// Step 3: Parse and handle
try {
    $notifications = $handler->handle($rawBody);
    http_response_code(200);
} catch (WebhookException $e) {
    http_response_code(400);
}

Message Types

Type	Enum	Description
text	MessageType::Text	Plain text message
image	MessageType::Image	Image with optional caption
video	MessageType::Video	Video with optional caption
audio	MessageType::Audio	Audio message
document	MessageType::Document	Document with filename
sticker	MessageType::Sticker	Sticker
location	MessageType::Location	GPS coordinates with name/address
contacts	MessageType::Contacts	Contact cards
button	MessageType::Button	Quick reply button tap
interactive	MessageType::Interactive	Button reply or list selection
reaction	MessageType::Reaction	Emoji reaction
order	MessageType::Order	Product order

Listen by Message Type

use RenzoJohnson\WhatsAppWebhook\MessageType;
use RenzoJohnson\WhatsAppWebhook\Notification\MessageNotification;

$handler->onMessage(MessageType::Text, function (MessageNotification $msg): void {
    echo $msg->text();
});

$handler->onMessage(MessageType::Image, function (MessageNotification $msg): void {
    echo "Image: {$msg->mediaId()} ({$msg->mediaMimeType()})";
    echo "Caption: {$msg->caption()}";
});

$handler->onMessage(MessageType::Location, function (MessageNotification $msg): void {
    echo "Location: {$msg->latitude()}, {$msg->longitude()}";
    echo "Name: {$msg->locationName()}";
});

$handler->onMessage(MessageType::Interactive, function (MessageNotification $msg): void {
    if ($msg->interactiveType() === 'button_reply') {
        echo "Button: {$msg->interactiveButtonTitle()} (ID: {$msg->interactiveButtonId()})";
    }
    if ($msg->interactiveType() === 'list_reply') {
        echo "List: {$msg->interactiveListTitle()}";
    }
});

$handler->onMessage(MessageType::Reaction, function (MessageNotification $msg): void {
    echo "Reacted with {$msg->reactionEmoji()} to {$msg->reactionMessageId()}";
});

Listen to All Messages

$handler->onAnyMessage(function (MessageNotification $msg): void {
    error_log($msg->getSummary());
});

Status Updates

use RenzoJohnson\WhatsAppWebhook\StatusType;
use RenzoJohnson\WhatsAppWebhook\Notification\StatusNotification;

$handler->onStatus(StatusType::Delivered, function (StatusNotification $status): void {
    echo "Delivered to {$status->recipientId}";
});

$handler->onStatus(StatusType::Read, function (StatusNotification $status): void {
    echo "Read by {$status->recipientId}";
});

$handler->onStatus(StatusType::Failed, function (StatusNotification $status): void {
    if ($status->hasErrors()) {
        echo "Error {$status->errorCode()}: {$status->errorTitle()}";
    }
});

$handler->onAnyStatus(function (StatusNotification $status): void {
    error_log($status->getSummary());
});

Pricing and Conversation Info

$handler->onAnyStatus(function (StatusNotification $status): void {
    if ($status->isBillable()) {
        echo "Category: {$status->pricingCategory()}";
        echo "Model: {$status->pricingModel()}";
    }

    if ($status->conversationId()) {
        echo "Conversation: {$status->conversationId()}";
        echo "Origin: {$status->conversationOrigin()}";
    }
});

Forwarded Messages

$handler->onAnyMessage(function (MessageNotification $msg): void {
    if ($msg->isForwarded()) {
        echo "This message was forwarded";
    }

    if ($msg->isFrequentlyForwarded()) {
        echo "This message has been forwarded many times";
    }

    if ($msg->contextMessageId()) {
        echo "Reply to: {$msg->contextMessageId()}";
    }
});

Parse Without Dispatching

$notifications = $handler->parse($rawBody);

foreach ($notifications as $notification) {
    if ($notification instanceof MessageNotification) {
        echo $notification->getSummary();
    }
}

Error Handling

use RenzoJohnson\WhatsAppWebhook\WebhookException;

try {
    $handler->parse($rawBody);
} catch (WebhookException $e) {
    // Invalid JSON, wrong object type, empty entry
}

Related Packages

• whatsapp-cloud-api — Send WhatsApp messages via Cloud API

Links

• Packagist
• GitHub
• Issues
• Author

License

MIT License. Copyright (c) 2026 Renzo Johnson.