Scoring signups server-side with the REST API

When a signup does not come from a browser you control — a mobile app, a server-to-server flow, or a form you would rather score after submission — call the REST API directly.

Send a POST /v1/score request with a bearer token (your API key) and a JSON body containing the user's fields (email, phone, address, country and any custom fields). The response returns the score (0–100), the verdict (allow / review / block), the reason codes, merchant advice, latency metrics and a check ID.

The API supports idempotency keys so a retried request is not double-counted, and paths are versioned (/v1/…) so upgrades will not break your integration. Your code reads the verdict and decides what to do — the API never blocks a user for you, unlike the widget which can act automatically.