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

# Declare a property

> Record a seller-declared property under an already-declared publisher domain. At least one of propertyId, an identifier, or name is required. A publisher-origin adagents.json declaration with the same property key supersedes the seller-declared record (outcome: already_resolved).



## OpenAPI

````yaml /v2/storefront-api-v2.yaml post /property-roster/properties
openapi: 3.0.0
info:
  title: Scope3 Storefront API
  version: 2.0.0
  description: |-
    REST API for partners to manage storefronts, inventory sources, and billing.

    ## Authentication

    All endpoints require a Bearer token in the Authorization header:
    ```
    Authorization: Bearer your-api-key
    ```

    ## Base URL

    `https://api.interchange.io/api/v2/storefront`

    ## For AI Agents

    AI agents can use the MCP endpoint at `/mcp/v2/storefront` with three tools:
    - `initialize`: Start an MCP session
    - `api_call`: Make REST API calls
    - `ask_about_capability`: Learn about API features
servers:
  - url: https://api.interchange.io/api/v2/storefront
    description: Production server
security: []
tags:
  - name: Account
    description: Account management, service tokens, and preferences
  - name: Storefront
    description: Manage storefront and inventory sources
  - name: Storefront Agents
    description: List and manage registered sales, signals, and outcomes agents
  - name: Storefront Activity
    description: Audit log of configuration and inventory changes on the storefront
  - name: Storefront Billing
    description: Payout bank details and billing configuration for storefronts
  - name: AI Usage
    description: Storefront AI token usage visibility by model
  - name: MCP
    description: Model Context Protocol endpoints
paths:
  /property-roster/properties:
    post:
      tags:
        - Storefront
      summary: Declare a property
      description: >-
        Record a seller-declared property under an already-declared publisher
        domain. At least one of propertyId, an identifier, or name is required.
        A publisher-origin adagents.json declaration with the same property key
        supersedes the seller-declared record (outcome: already_resolved).
      operationId: declareRosterProperty
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                domain:
                  description: A publisher domain already declared on this storefront.
                  type: string
                  minLength: 1
                property:
                  description: >-
                    The declared property. At least one of propertyId, an
                    identifier, or name is required — the roster never invents
                    identity.
                  type: object
                  properties:
                    propertyId:
                      type: string
                      minLength: 1
                      maxLength: 512
                    propertyType:
                      type: string
                      enum:
                        - website
                        - mobile_app
                        - ctv_app
                        - desktop_app
                        - dooh
                        - podcast
                        - radio
                        - streaming_audio
                    name:
                      type: string
                      minLength: 1
                      maxLength: 512
                    identifiers:
                      maxItems: 50
                      type: array
                      items:
                        type: object
                        properties:
                          type:
                            type: string
                          value:
                            type: string
                        required:
                          - type
                          - value
                    tags:
                      maxItems: 50
                      type: array
                      items:
                        type: string
                        minLength: 1
                        maxLength: 512
              required:
                - domain
                - property
      responses:
        '201':
          description: Declare a property
          content:
            application/json:
              schema:
                type: object
                properties:
                  outcome:
                    description: >-
                      declared: recorded as seller-declared identity.
                      already_resolved: a publisher-origin record already covers
                      this property — it wins, and the seller's claim is
                      recorded on it so the declaration survives if that source
                      later retracts the property.
                    type: string
                    enum:
                      - declared
                      - already_resolved
                  propertyKey:
                    type: string
                required:
                  - outcome
                  - propertyKey
                additionalProperties: false
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      security:
        - bearerAuth: []
components:
  schemas:
    ErrorResponse:
      description: Standard error response
      type: object
      properties:
        data:
          type: string
          nullable: true
          enum:
            - null
        error:
          $ref: '#/components/schemas/ApiError'
      required:
        - data
        - error
      additionalProperties: false
    ApiError:
      description: Structured error object
      type: object
      properties:
        code:
          description: Machine-readable error code
          type: string
        message:
          description: Human-readable error message
          type: string
        field:
          description: Field path associated with the error
          type: string
        details:
          description: Additional error context
          type: object
          additionalProperties: {}
      required:
        - code
        - message
      additionalProperties: false
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key or access token

````