Slack API ➔ Supabase Webhook Pipeline Specification Webhook Specification, Headers & Security

Technical Integration Summary

Developer documentation for integrating Slack API ➔ Supabase Webhook Pipeline Specification webhooks into backend applications. Secure your endpoint with HMAC signature checking and payload validation.

Supported Events: message.new callback_query inline_query message.reaction

Authentication & Request Headers

Security validation specs for Slack API ➔ Supabase Webhook Pipeline Specification endpoints:

X-SlackAPI➔SupabaseWebhookPipelineSpecification-Signature: t=1789764056,v1=9cff60121b3af39c732598ad

Signature Verification Implementations

Node.js (Express)

const crypto = require('crypto');
const expected = crypto.createHmac('sha256', secret).update(rawBody).digest('hex');
const isValid = crypto.timingSafeEqual(Buffer.from(expected), Buffer.from(signature));

Python (Flask / FastAPI)

import hmac, hashlib
expected = hmac.new(secret.encode(), raw_body, hashlib.sha256).hexdigest()
is_valid = hmac.compare_digest(expected, incoming_sig)

Sample Event Payload (message.new)

{
  "id": "evt_slack-to-supabase.html_91007",
  "event": "message.new",
  "created_at": 1789764056,
  "data": {
    "resource_id": "res_745",
    "status": "active"
  }
}

cURL Request Simulation

curl -X POST https://your-domain.com/webhook/slack-to-supabase.html \
  -H "Content-Type: application/json" \
  -H "X-SlackAPI➔SupabaseWebhookPipelineSpecification-Signature: t=1789764056,v1=9cff60121b3af39c732598ad" \
  -d '{"id": "evt_slack-to-supabase.html_91007", "event": "message.new", "created_at": 1789764056, "data": {"resource_id": "res_745", "status": "active"}}'

HTTP Response Rules

Status Code	Status Meaning	Integration Action
`200 OK`	Success	Event payload validated and queued.
`400 Bad Request`	Malformed Payload	Check payload structure and JSON formatting.
`401 Unauthorized`	Signature Mismatch	Verify secret key and digest computation.
`500 Error`	Server Error	Triggers provider automated retry backoff.

Security Best Practices for Slack API ➔ Supabase Webhook Pipeline Specification

Always process incoming events asynchronously using a message queue. Never perform long-running DB queries or external API calls synchronously within the HTTP response handler.

Frequently Asked Questions

How does Slack API ➔ Supabase Webhook Pipeline Specification handle automatic delivery retries?

Failed deliveries (non-2xx responses) trigger an exponential backoff retry schedule over a period ranging from 24 to 72 hours.

What is the response timeout for Slack API ➔ Supabase Webhook Pipeline Specification webhooks?

Your endpoint must return an HTTP 2xx response within 2000ms. Offload heavy processing (email, DB writes) to an asynchronous task queue.

Why does signature validation fail on Express/Flask?

Your framework might be auto-parsing JSON. HMAC generation requires the exact raw byte buffer of the request body before JSON middleware alters keys or spacing.