> ## 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.

# Request human help choosing an IU plan

> A direct billing administrator may request plan help using the current commercial document handoff version. The request uses the customer request ledger and does not accept a plan or grant access. Reply preference is in-app only. Repeated requests recur on the same tracked commercial request.



## OpenAPI

````yaml /v2/buyer-api-v2.yaml post /billing/iu-rate-card/mcp-app/help
openapi: 3.0.0
info:
  title: Scope3 Buyer API
  version: 2.0.0
  description: |-
    REST API for advertisers to manage advertisers, campaigns, and reporting.

    ## Authentication

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

    ## Base URL

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

    ## For AI Agents

    AI agents can use the MCP endpoint at `/mcp/v2/buyer` 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/buyer
    description: Production server
security: []
tags:
  - name: Signup
    description: Request reviewed access to Interchange
  - name: Account
    description: Account management, service tokens, and preferences
  - name: Asks
    description: >-
      What you are waiting on Scope3 for — support, product, and supply asks in
      one list
  - name: Advertisers
    description: Manage advertisers
  - name: Product Discovery
    description: Discover and select products
  - name: Campaigns
    description: Manage advertising campaigns
  - name: Creatives
    description: Build, manage, and sync campaign creatives via AdCP Creative Protocol
  - name: Reporting
    description: Access performance metrics
  - name: Event Sources
    description: >-
      Manage event source configurations and log conversion/marketing events for
      attribution
  - name: Property Lists
    description: Validate property lists against AAO registry
  - name: Sales Agents
    description: View and connect sales agents
  - name: Measurement
    description: Measurement sources, records, context, and freshness
  - name: Syndication
    description: Syndicate resources to ADCP agents
  - name: Tasks
    description: Track async operation status
  - name: Buyer Billing
    description: >-
      Consolidated invoicing for buyers — invoices and pending invoice items
      issued by Scope3 across the buyer customer.
  - name: MCP
    description: Model Context Protocol endpoints for AI agents
paths:
  /billing/iu-rate-card/mcp-app/help:
    servers:
      - url: https://api.interchange.io/api/v2
        description: Production server
    post:
      tags:
        - Buyer Billing
      summary: Request human help choosing an IU plan
      description: >-
        A direct billing administrator may request plan help using the current
        commercial document handoff version. The request uses the customer
        request ledger and does not accept a plan or grant access. Reply
        preference is in-app only. Repeated requests recur on the same tracked
        commercial request.
      operationId: requestIuPlanHelp
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                contextVersion:
                  type: string
                  pattern: ^help-v1:[0-9a-f]{64}$
                enterprisePlan:
                  type: string
                  enum:
                    - ENTERPRISE_LISTING
                    - ENTERPRISE_MERCHANDISING
                message:
                  type: string
                  maxLength: 1000
                contactPreference:
                  type: string
                  enum:
                    - IN_APP
              required:
                - contextVersion
                - message
                - contactPreference
              additionalProperties: false
      responses:
        '200':
          description: Request human help choosing an IU plan
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      requestId:
                        type: string
                        minLength: 1
                      trackingAvailable:
                        type: boolean
                      returnUrl:
                        type: string
                        format: uri
                    required:
                      - requestId
                      - trackingAvailable
                      - returnUrl
                    additionalProperties: false
                required:
                  - data
                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'
        '403':
          description: >-
            The caller is not a direct human billing administrator or the
            Enterprise path is not applicable.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: >-
            The displayed applicability or offer context changed. Refresh and
            explicitly resubmit.
          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:
      type: object
      properties:
        data:
          type: string
          nullable: true
          enum:
            - null
        error:
          $ref: '#/components/schemas/ApiError'
      required:
        - data
        - error
      additionalProperties: false
      description: Standard error response
    ApiError:
      type: object
      properties:
        code:
          type: string
          description: Machine-readable error code
        message:
          type: string
          description: Human-readable error message
        field:
          description: Field path associated with the error
          type: string
        details:
          description: Additional error context
          type: object
          additionalProperties: {}
      required:
        - code
        - message
      additionalProperties: false
      description: Structured error object
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key or access token

````