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Walk me through swapping our billing-agent from REST to MPP for agent-to-agent invoicing. Keep it short.

Three changes. (1) Replace your `/invoice` POST handler with an `mpp.publish('invoice')` call — the SDK signs with the agent's passport key. (2) Subscribe to `mpp.on('payment')` instead of polling Stripe webhooks. (3) Drop the API-key-rotation cron. Passports rotate themselves.

tsimport { mpp } from '@foundry/mpp' mpp.publish('invoice', { amount: 4_00, to: agentDID }) mpp.on('payment', (evt) => ledger.credit(evt))

What happens if the receiver agent doesn't have a passport?

MPP rejects unsigned payloads at the network layer. The receiver gets a `PASSPORT_REQUIRED` error and your sender retries against your fallback rail (default: Stripe Connect). You can override the fallback per-call with `mpp.publish('invoice', { fallback: 'usdc-direct' })` — that