Join Start Pattern

1. Get short-lived signature from backend.
2. Initialize/auth SDK and verify callback result.
3. Join with meeting number + passcode.
4. Register required meeting delegates before user interaction.

Start (host)

1. Backend provides host ZAK + role-aware signature.
2. Start flow executes with host token.
3. Host-only controls enabled after privilege verification.

Guardrails

• Keep SDK secret off client.
• Validate delegate callbacks under both default and custom UI.
• Explicitly handle leave/end transitions for cleanup.