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Every platform below works with Flowsign today through the public API and webhooks, using nothing but that platform’s own HTTP and webhook steps. No Flowsign app needs to be installed.

Zapier

Catch Flowsign webhooks with Webhooks by Zapier and call the API with a Custom Request.

n8n

Catch Flowsign webhooks with the Webhook node and call the API with HTTP Request.

Make

Catch Flowsign webhooks with a Custom webhook and call the API with HTTP.

Power Automate

Catch Flowsign webhooks with an HTTP trigger and call the API with the HTTP action.
Calling the API needs a Bearer API key (fsk_...); create one at Settings > API keys (my.flowsign.app/settings/api-keys). A key acts in the one workspace it was issued for. See Authentication. Receiving events needs a webhook endpoint at Settings > Webhooks instead, no API key required; an endpoint receives events for its own workspace’s packages. See Webhooks.
The API and webhooks are included in the Enterprise plan. Creating a webhook endpoint needs the manage webhooks permission.
Settings > Integrations in the app links out to each of these four platforms. The Slack, Xero, HubSpot and Salesforce cards there are marked Coming soon.