> ## Documentation Index > Fetch the complete documentation index at: https://docs.batchrelay.com/llms.txt > Use this file to discover all available pages before exploring further. # Create or reuse a hosted Checkout from an owned frozen quote > Stable idempotency; return origin configured server-side. Paid fulfillment begins only after signed event amount/currency/livemode/session/ownership checks and durable tax accounting. Responses are no-store. Caller prices, provider identifiers and payment methods are never accepted. ## OpenAPI ````yaml https://api.batchrelay.com/openapi.json post /v1/consumer/sessions/{session_id}/checkout openapi: 3.1.0 info: description: >- Provider-neutral print catalog and prepared-media validation. This document covers only routes owned by the Go service; it deliberately excludes migration-proxied order lifecycle routes and all provider payloads. license: name: Proprietary url: https://github.com/SENTINELITE/Batch-Relay-Go/blob/main/README.md title: Batch Relay API version: 1.0.1 servers: - url: https://api.batchrelay.com security: [] tags: - description: >- Explicitly authorized purchaser context for studio order events. Event payloads remain free of contact details. name: Event context - description: Service health and the public API description. name: System - description: Test Mode session creation and API credential entry points. name: Authentication - description: >- Provider-neutral canonical catalog resources and platform-owned semantic definitions. name: Catalog - description: Studio-scoped guest checkout-link management. name: Checkout links - description: >- One-way operational event messages. Alert emails contain no message body and recipients read messages after Batch Relay authentication. name: Studio messages - description: >- Explicit, reviewable sandbox-to-Live promotion plans for forms, catalog, and storefront configuration. name: Sandbox promotions - description: Provider-neutral validation, quoting, and order lifecycle operations. name: Print orders - description: Managed fulfillment asset ingestion and metadata. name: Managed assets - description: Studio-scoped original asset upload sessions and objects. name: Studio assets - description: Prepared and confirmed event roster team changes. name: Event team changes - description: Authenticated studio, event, and form-management operations. name: Studio management - description: >- Authenticated studio retail catalog management. Draft and publication lifecycles are explicit per product or package. name: Studio catalog - description: >- Authenticated singular storefront assortment management. PATCH atomically publishes a new immutable assortment revision; no storefront draft lifecycle exists yet. name: Storefront - description: Managed media used by the studio retail catalog. name: Studio catalog assets - description: Template rendering job creation and retrieval. name: Template renders - description: >- Published browser-side template packages and short-lived server proof renders. Preview artifacts are never fulfillment artwork. name: Browser previews - description: API account and credential administration. name: API accounts - description: >- Standalone guest purchases; feature disabled by default. Temporary merchandise USD0.75 5x7 and USD1.50 8x10, plus authoritative shipping and tax. name: Consumer printing paths: /v1/consumer/sessions/{session_id}/checkout: parameters: - $ref: '#/components/parameters/ClientSurface' - $ref: '#/components/parameters/ClientVersion' - $ref: '#/components/parameters/InvocationMode' post: tags: - Consumer printing summary: Create or reuse a hosted Checkout from an owned frozen quote description: >- Stable idempotency; return origin configured server-side. Paid fulfillment begins only after signed event amount/currency/livemode/session/ownership checks and durable tax accounting. Responses are no-store. Caller prices, provider identifiers and payment methods are never accepted. operationId: createConsumerPrintCheckout parameters: - in: path name: session_id required: true schema: maxLength: 100 type: string - in: header name: Idempotency-Key required: true schema: maxLength: 200 minLength: 1 type: string requestBody: content: application/json: schema: additionalProperties: false properties: quote_id: maxLength: 100 type: string required: - quote_id type: object required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/ConsumerCheckout' description: Success '400': description: Invalid bounded request or prepared artwork '401': description: Capability unavailable, expired or belongs to another session '409': description: Frozen quote, cart revision or idempotency conflict '429': description: Bounded source or session rate exceeded '503': description: Disabled or authoritative payment/fulfillment dependency unavailable security: - consumerCapability: [] components: parameters: ClientSurface: description: >- Untrusted optional analytics hint naming the calling client surface. It never affects authorization, routing, pricing, or behavior. in: header name: X-BatchRelay-Client-Surface required: false schema: maxLength: 100 minLength: 1 type: string ClientVersion: description: >- Untrusted optional analytics hint naming the calling client version. It never affects authorization, routing, pricing, or behavior. in: header name: X-BatchRelay-Client-Version required: false schema: maxLength: 100 minLength: 1 type: string InvocationMode: description: >- Untrusted optional analytics hint naming the invocation mode. It never affects authorization, routing, pricing, or behavior. in: header name: X-BatchRelay-Invocation-Mode required: false schema: maxLength: 100 minLength: 1 type: string schemas: ConsumerCheckout: additionalProperties: false properties: checkout_url: format: uri type: string expires_at: format: date-time type: string order_id: type: string required: - order_id - checkout_url - expires_at type: object securitySchemes: consumerCapability: bearerFormat: br_consumer_<256-bit random capability> description: >- Dedicated expiring guest-session capability. Never a developer API key. No Batch Relay account or Studio membership required. scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.