End-to-end encryption in WhatsApp Business
WhatsApp uses end-to-end encryption for all messages, including those sent via Business API. Message content is readable only by sender and recipient.
Note: E2E encryption protects messages in transit, but does not protect data you store in your system.
API access security
API credentials (API key or Bearer token) must be treated like passwords: never hardcode them in source code, never share via email or chat, and rotate them periodically.
Implement the principle of least privilege and monitor API usage patterns.
Webhook security
Chat API webhooks include a signature in the header that allows verifying the message actually comes from Chat API. Always verify this signature before processing the webhook payload.
GDPR and compliance for EU companies
For European companies, GDPR requires that customer personal data (phone numbers, conversation content) be handled with appropriate security measures. Chat API, with EU hosting and GDPR compliance, simplifies compliance.
Personal data contained in conversations must be deleted when the customer requests it (right to erasure).
