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SDKs

Use the SDKs to keep Proxy Checkout protocol details out of merchant application code.

Package Surface
@proxy-checkout/cli Agent-ready browser authentication and local Proxy/Stripe webhook development.
@proxy-checkout/server-js Server-side API client, sessions, subscriptions, and webhooks.
@proxy-checkout/stripe-server-js Shared Stripe acquisition helpers for direct PaymentIntent, direct SetupIntent/Subscription, Checkout, and Checkout cart synchronization.
@proxy-checkout/shopify-server-js Storefront Cart creation/retrieval and secret-safe checkout helpers for the public app.
@proxy-checkout/client-js Browser helpers for payer checkout pages.

SDK package changelogs will live in the SDK changelogs page.

See Local webhooks for the CLI installation, authentication, and forwarding workflow.

See Stripe direct subscriptions for openSetupIntent, both openSubscription branches, shared-viewer rules, complete lifecycle evidence, and exact capability requirements.