Server-side Node/TypeScript SDK for the M2C payment-vendor auction API.
Fulfillment webhook receiver for M2C: verify conversion webhooks and serve checkout status to the @m2c/checkout browser SDK.
Shared protocol primitives (HMAC signing, error taxonomy, money) for the M2C SDKs.
Vendor-side Node/TypeScript SDK for the M2C payment-vendor auction: verify bid requests, sign bid responses, report conversions.
Headless browser checkout SDK for M2C: run an auction, redirect to the winning vendor's hosted checkout, and reflect conversion status.