See the end‑to‑end flow in the Webhooks overview.

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Installation

Install the required packages: 
pip install fastapi uvicorn svix chunkr_ai

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Python (FastAPI) — Verify with Svix and fetch Task

This minimal FastAPI handler verifies the webhook signature using Svix and then calls chunkr.get_task(task_id). 
from fastapi import FastAPI, Request, Response, status
from svix.webhooks import Webhook, WebhookVerificationError
from chunkr_ai import Chunkr
import os

app = FastAPI()

CHUNKR_WEBHOOK_SECRET = os.environ["CHUNKR_WEBHOOK_SECRET"]  # starts with "whsec_"
chunkr = Chunkr()  # uses CHUNKR_API_KEY from env if not provided

@app.post("/webhook/chunkr", status_code=status.HTTP_204_NO_CONTENT)
async def webhook_handler(request: Request) -> Response:
    headers = request.headers
    payload = await request.body()  # Verify against the raw body

    try:
        msg = Webhook(CHUNKR_WEBHOOK_SECRET).verify(payload, headers)  # dict
    except WebhookVerificationError:
        return Response(status_code=status.HTTP_400_BAD_REQUEST)

    task_id = msg.get("task_id")
    status_str = msg.get("status")

    # Fetch only once the task is completed
    if task_id and status_str == "Succeeded":
        _task = chunkr.get_task(task_id)
        # Do something with _task (e.g., persist results)

    # No content response for webhook receivers
    return Response(status_code=status.HTTP_204_NO_CONTENT)
Run the server locally: 
uvicorn main:app --reload --port 8000