> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stella-commerce.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Checkout

> Create a checkout from a cart.

Validates inventory availability + computes tax + stamps shipping
rate (if `shipping_rate_id` provided). Total reflects subtotal +
tax + shipping at create time so the Stripe payment page sees a
stable amount.

Returns the checkout body PLUS a freshly-minted `chk_…` access
token. The token is shown EXACTLY ONCE — the storefront should
embed it into the buyer-facing `checkout_url` (typically as a URL
fragment so it doesn't leak via Referer headers). The
`checkout-web` SPA uses it as `Authorization: Bearer chk_…` to
drive subsequent reads + payment-intent creation.



## OpenAPI

````yaml /api-reference/openapi.json post /api/storefront/checkout
openapi: 3.1.0
info:
  title: Agentic Commerce API
  description: |2-

        Agentic Commerce API - E-commerce Backend

        ## APIs

        ### Dashboard API (`/api/dashboard`)
        Authenticated endpoints for merchant management:
        - Products, Variants, Options
        - Inventory management
        - Orders and fulfillment
        - Customers
        - Collections

        ### Storefront API (`/api/storefront`)
        Public endpoints for client websites:
        - Product catalog
        - Collections
        - Cart management
        - Checkout

        ### Sync API (`/api/sync`)
        Integration endpoints for zunkiree-search:
        - Product sync
        - Availability checks
        - Order creation from AI widget
        
  version: 1.0.0
servers: []
security: []
paths:
  /api/storefront/checkout:
    post:
      tags:
        - Storefront
        - Checkout
      summary: Create Checkout
      description: |-
        Create a checkout from a cart.

        Validates inventory availability + computes tax + stamps shipping
        rate (if `shipping_rate_id` provided). Total reflects subtotal +
        tax + shipping at create time so the Stripe payment page sees a
        stable amount.

        Returns the checkout body PLUS a freshly-minted `chk_…` access
        token. The token is shown EXACTLY ONCE — the storefront should
        embed it into the buyer-facing `checkout_url` (typically as a URL
        fragment so it doesn't leak via Referer headers). The
        `checkout-web` SPA uses it as `Authorization: Bearer chk_…` to
        drive subsequent reads + payment-intent creation.
      operationId: create_checkout_api_storefront_checkout_post
      parameters:
        - name: X-Site-ID
          in: header
          required: true
          schema:
            type: string
            title: X-Site-Id
        - name: X-Stella-Token
          in: header
          required: false
          schema:
            anyOf:
              - type: string
              - type: 'null'
            title: X-Stella-Token
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CheckoutCreate'
      responses:
        '201':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CheckoutCreatedResponse'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    CheckoutCreate:
      properties:
        cart_id:
          type: string
          format: uuid
          title: Cart Id
        email:
          type: string
          format: email
          title: Email
        shipping_address:
          $ref: '#/components/schemas/AddressSchema'
        billing_address:
          anyOf:
            - $ref: '#/components/schemas/AddressSchema'
            - type: 'null'
        shipping_rate_id:
          anyOf:
            - type: string
              format: uuid
            - type: 'null'
          title: Shipping Rate Id
      type: object
      required:
        - cart_id
        - email
        - shipping_address
      title: CheckoutCreate
      description: Schema for creating checkout.
    CheckoutCreatedResponse:
      properties:
        id:
          type: string
          format: uuid
          title: Id
        cart_id:
          type: string
          format: uuid
          title: Cart Id
        email:
          type: string
          title: Email
        shipping_address:
          $ref: '#/components/schemas/AddressSchema'
        billing_address:
          $ref: '#/components/schemas/AddressSchema'
        items:
          items:
            $ref: '#/components/schemas/CartItemResponse'
          type: array
          title: Items
        subtotal:
          type: string
          pattern: ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$
          title: Subtotal
        tax_amount:
          type: string
          pattern: ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$
          title: Tax Amount
        shipping_amount:
          type: string
          pattern: ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$
          title: Shipping Amount
        total:
          type: string
          pattern: ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$
          title: Total
        currency:
          type: string
          title: Currency
        status:
          type: string
          title: Status
        payment_intent_id:
          anyOf:
            - type: string
            - type: 'null'
          title: Payment Intent Id
        order_id:
          anyOf:
            - type: string
              format: uuid
            - type: 'null'
          title: Order Id
        created_at:
          type: string
          format: date-time
          title: Created At
        updated_at:
          type: string
          format: date-time
          title: Updated At
        completed_at:
          anyOf:
            - type: string
              format: date-time
            - type: 'null'
          title: Completed At
        access_token:
          type: string
          title: Access Token
        access_token_expires_at:
          type: string
          format: date-time
          title: Access Token Expires At
      type: object
      required:
        - id
        - cart_id
        - email
        - shipping_address
        - billing_address
        - items
        - subtotal
        - tax_amount
        - shipping_amount
        - total
        - currency
        - status
        - created_at
        - updated_at
        - access_token
        - access_token_expires_at
      title: CheckoutCreatedResponse
      description: |-
        Returned ONLY from `POST /api/storefront/checkout`.

        Layers `access_token` (the freshly-minted `chk_…` Bearer for the
        `checkout-web` SPA) on top of the standard CheckoutResponse. The
        plaintext is shown EXACTLY ONCE; subsequent reads via
        `GET /api/storefront/checkout/{id}` use the Authorization header
        and never echo the token back.
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    AddressSchema:
      properties:
        first_name:
          anyOf:
            - type: string
            - type: 'null'
          title: First Name
        last_name:
          anyOf:
            - type: string
            - type: 'null'
          title: Last Name
        company:
          anyOf:
            - type: string
            - type: 'null'
          title: Company
        address1:
          anyOf:
            - type: string
            - type: 'null'
          title: Address1
        address2:
          anyOf:
            - type: string
            - type: 'null'
          title: Address2
        city:
          anyOf:
            - type: string
            - type: 'null'
          title: City
        state:
          anyOf:
            - type: string
            - type: 'null'
          title: State
        postal_code:
          anyOf:
            - type: string
            - type: 'null'
          title: Postal Code
        country:
          anyOf:
            - type: string
            - type: 'null'
          title: Country
        phone:
          anyOf:
            - type: string
            - type: 'null'
          title: Phone
      type: object
      title: AddressSchema
      description: >-
        Schema for address. Fields are optional to support simpler address
        formats from AI widget.
    CartItemResponse:
      properties:
        id:
          type: string
          format: uuid
          title: Id
        variant_id:
          type: string
          format: uuid
          title: Variant Id
        product_id:
          type: string
          format: uuid
          title: Product Id
        product_name:
          type: string
          title: Product Name
        variant_name:
          type: string
          title: Variant Name
        sku:
          anyOf:
            - type: string
            - type: 'null'
          title: Sku
        image_url:
          anyOf:
            - type: string
            - type: 'null'
          title: Image Url
        price:
          type: string
          pattern: ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$
          title: Price
        quantity:
          type: integer
          title: Quantity
        total:
          type: string
          pattern: ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$
          title: Total
      type: object
      required:
        - id
        - variant_id
        - product_id
        - product_name
        - variant_name
        - sku
        - image_url
        - price
        - quantity
        - total
      title: CartItemResponse
      description: Schema for cart item in response.
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError

````