ZenSched `webhook_register` — Register an HTTPS webhook. events_json = JSON list from: ['worker.invited', 'worker.activated', 'shift.checkin', 'shift.checkout', 'shift.missed', 'form.submitted', 'timesheet.ready', 'billing.low_balance', 'webhook.disabled']. Returns the HMAC signing secret (or pass your own). Pay-per-call $0.01 USDC; the paying wallet owns the org (auto-provisioned on first call). Catalog: https://mcp.zensched.com/x402/tools

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