Identity API

Use the Identity API to connect anonymous DataFast visitors to known users in your product.

This is useful for CRM enrichment, support tools, funnel analysis, and AI agents that need to understand which product users match website visitors.

Endpoint	Method	Path	Purpose
Identify users	POST	`/api/v1/identify`	Link a DataFast visitor ID to your user ID and custom profile metadata

Identify users

POST https://datafa.st/api/v1/identify

Send this endpoint from your backend after login, signup, or another event where you know the user behind a DataFast visitor.

df_ website API key for one website. No websiteId query parameter required.
dft_ account token with identify:write. Pass websiteId as a query parameter.

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