Fetch the QR-code token for each attendee to build a custom check-in scanner against Universe events
domain: universe.com · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Query event(id: "<event_id>") { attendees { nodes { id firstName lastName email token } } } via the GraphQL endpoint.
Encode the returned token value into a QR code (or barcode) for entry scanning.
Validate scanned tokens against the same attendees query at the door to mark entry, keeping a local record of already-used tokens.
Re-fetch the attendees query periodically (or after each scan) rather than caching a static list, so cancellations or refunds that happen mid-event are reflected in the scanner's local validation.
Known gotchas
Universe's published code examples only show a read query for the token field — confirm with Universe support whether a dedicated check-in/redemption mutation exists before relying on client-side validation alone.
Treat the token field as sensitive — anyone holding the raw token string can be checked in as that attendee, so avoid exposing it in client-side logs or unauthenticated endpoints.
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