Tunn3l

Tunn3l is a third-party tunnel booking platform that the IBA integrates with, sitting alongside the existing Convergence and FuzeMetrix integrations.

What the integration does

The Tunn3l integration mirrors the FuzeMetrix contract — a validation-focused integration:

Member validation. When a flyer checks in at a Tunn3l tunnel, the tunnel sends the IBA the flyer’s member ID and IBA PIN, and the IBA responds with their current standing — name, level, currency status. That’s what stops a non-member from passing themselves off as qualified for advanced flight time.

Bookings. Tunn3l can also send the IBA a completed booking. As with FuzeMetrix, a logbook entry is created automatically only when the member’s flyer currency is active (the currency split), and duplicate bookings are rejected.

What Tunn3l doesn’t do

Like FuzeMetrix — and unlike the fuller Convergence integration for USA tunnels — Tunn3l does not have member-specific custom booking links or group-based affiliate-store pricing.

Trust and authentication

Every payload between the IBA and a Tunn3l tunnel is signed using HMAC-SHA256 with a shared secret. Both sides verify the signature before acting. A request that fails signature verification is rejected without a hint about what was wrong — deliberately, to avoid leaking information to attackers.

Where this sits in the platform

Tunn3l is one of three external booking systems the IBA integrates with — alongside Convergence (USA tunnels, full integration) and FuzeMetrix (non-USA, validation-focused).

For the rules and the technical contract, see Business logic → Tunnel booking rules.