Build a WhatsApp Coexistence Sync Monitor in Python
WhatsApp coexistence lets a team use the WhatsApp Business app and the WhatsApp Business API on the same phone number. That is useful when human agents handle sensitive or unusual conversations in the app while automated systems send reminders and updates through the API. It also creates a synchronization problem: when a human sends a message in the Business app, the API-side application needs a…
The WhatsApp Coexistence Sync Monitor in Python is a small Flask service designed to address the synchronization problem that arises when using both the WhatsApp Business app and the WhatsApp Business API on the same phone number. The monitor verifies Telnyx webhook signatures before parsing events, ensuring the integrity of the received messages.
It checks the number's coexistence state and acknowledges message.echo events created by Business-app activity while writing accepted events to a PII-minimized JSONL audit trail. The service includes a Flask webhook receiver that performs Ed25519 signature and timestamp checks to prevent replayed requests and responds with a 401 status code for invalid or missing signatures.
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