EXTENSIONS

Stripe Machine Payments Protocol (MPP) — agent buyer (probe/mint/pay over HTTP-402 Payment auth), consumer buyer (grant a Shared Payment Token from a Link wallet via link-cli, spend by reference), and full seller API (challenge/verify/charge/receipt/reconcile/refund) for fiat Shared Payment Tokens, built on mppx and the Stripe preview SDK

Stripe — snapshot products and prices, and idempotently ensure products, prices, and webhook endpoints exist. Captures price IDs (e.g. STRIPE_PRICE_PRO) and returns vaulted webhook signing secrets.