{
  "id": 15070786,
  "title": "Build a WhatsApp Coexistence Sync Monitor in Python",
  "url": "https://urgent.news/2026/10/16/build-a-whatsapp-coexistence-sync-monitor-in-python",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-10-16T23:30:28.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/sonam_gupta_dba00ec9473e5/build-a-whatsapp-coexistence-sync-monitor-in-python-40pp"
  },
  "original_language": "en",
  "account": null,
  "summary": "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.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}