Probable Causes
- Verify token defined in Meta console does not match server token string
- Server returning HTML or JSON instead of raw plain-text challenge
- Invalid SSL certificate on webhook server
Webhook & Media Engineering
Error 403 Forbidden
403 Forbidden
How to Fix WhatsApp Webhook Verification Token Mismatch & 403 Errors
When configuring your Callback URL in Meta Developer Console, Meta verifies ownership via an HTTP GET request containing a verify_token and challenge parameter.
Step-by-Step Resolution
Recommended Fix Protocol:
Check hub_verify_token against your secret. Return the raw hub_challenge parameter string as plain text with HTTP status 200 OK.
Technical Example / Code Payload:
if ($_GET['hub_verify_token'] === 'SECRET_TOKEN') {
header('Content-Type: text/plain');
echo $_GET['hub_challenge'];
exit;
}
Quick Answers
Frequently Asked Questions
Why does Meta reject my HTTPS URL?+
Meta requires a valid, publicly trusted SSL certificate (Let's Encrypt or commercial CA). Self-signed certificates fail.
Can I test webhooks on localhost?+
Yes, using tools like ngrok or Cloudflare Tunnel to expose a secure HTTPS tunnel.
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