"FORBIDDEN: current form/origin/product admission refused; INSUFFICIENT_SCOPE, NO_ACTIVE_BOT or typed Orders authority refusal; plan fences also normalize to FORBIDDEN"
"P1 server-side checkout relay, accepting server credentials or a publishable key only on this explicitly marked surface. Requires orders scope, not orders:write. The strict body names only the opaque form code; the guard resolves (tenant, code), verifies the live enabled checkout form, tenant product and form-bound Origin before every initial request and cached replay. Product, pricing, user identity, redirect and external_order_ref cannot be supplied. Anonymous order creation uses the existing Orders quote/create road. order_id is an opaque public code; Gateway buyer checkout remains a separate P2 surface behind StorefrontCustomerGuard and per-tenant order number/ownership checks. Surface-session JWT is refused."
operationId
"checkoutStorefront"
summary
"Start anonymous checkout for an admitted public form"