Slack integration

Status: signed Events API endpoint is live; the in-channel conversion bot (download → convert → upload back) is on the roadmap. There is no public "Add to Slack" button yet.

What works today

• POST /api/integrations/slack/events validates the X-Slack-Signature HMAC and timestamp on every request.
• URL verification challenges are answered correctly so you can already point a Slack app at the endpoint.
• When SLACK_SIGNING_SECRET is not configured on the server, the endpoint returns an "integration disabled" acknowledgement instead of accepting unsigned traffic.

Self-hosting / development setup

1. Create a Slack app at api.slack.com/apps.
2. Set Event Subscriptions → Request URL to https://<your-host>/api/integrations/slack/events.
3. Set SLACK_SIGNING_SECRET (and later SLACK_BOT_TOKEN) on the server.
4. Subscribe to the events you intend to handle (e.g. file_shared) — handler logic for those events will land in a follow-up task.

Today, you can already…

…use Zapier or Make to bridge Slack and pdftoexcelnow without code: their Slack triggers fire when a PDF is shared, and the pdftoexcelnow REST API converts it. Zapier & Make →