Waymark / Routes / slack.com Receive and verify Slack Events API callbacks
domain: slack.com · 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps Subscribe to events in app config with a public Request URL Answer the one-time url_verification challenge by echoing the challenge value Verify each request: compute HMAC-SHA256 of 'v0:{timestamp}:{raw body}' with the signing secret, compare to X-Slack-Signature Respond 200 within 3 seconds; process async Known gotchas Slack retries (x-slack-retry-num header) if you don't 200 within 3s — causing duplicate processing; ack first, work later Reject requests with timestamp older than 5 min (replay protection) Event payloads don't include full message history context — call conversations.replies if you need the thread
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