> ## 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. # Batch-reassign brought creatives to placements > Buyer-creative-v2 (feature-flagged). Reassigns several already-attached creatives to placements in one call (the card's "Save mappings" commit), then returns the refreshed confirmation card once. `mappings` is `[{ creative_id, format_id }]`. Returns 404 for callers not enrolled in the flag. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml post /campaigns/{campaignId}/creatives/placements 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: Account description: Account management, service tokens, and preferences - 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: Planning Briefs description: >- Share prospective briefs with publishers and collect their fit/quote/clarify/decline/book responses (gated by the demand-supply-signals flag). - 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: /campaigns/{campaignId}/creatives/placements: post: tags: - Creatives summary: Batch-reassign brought creatives to placements description: >- Buyer-creative-v2 (feature-flagged). Reassigns several already-attached creatives to placements in one call (the card's "Save mappings" commit), then returns the refreshed confirmation card once. `mappings` is `[{ creative_id, format_id }]`. Returns 404 for callers not enrolled in the flag. operationId: remapCreativePlacements parameters: - in: path name: campaignId schema: type: string required: true requestBody: required: true content: application/json: schema: type: object properties: mappings: minItems: 1 maxItems: 50 type: array items: type: object properties: creative_id: type: string minLength: 1 format_ids: minItems: 1 maxItems: 50 type: array items: type: object properties: agent_url: type: string minLength: 1 id: type: string minLength: 1 required: - agent_url - id required: - creative_id - format_ids required: - mappings responses: '200': description: Batch-reassign brought creatives to placements content: application/json: schema: type: object properties: campaign_id: type: string campaign_name: type: string coverage: type: object properties: total_placements: type: integer minimum: -9007199254740991 maximum: 9007199254740991 covered_placements: type: integer minimum: -9007199254740991 maximum: 9007199254740991 required: - total_placements - covered_placements additionalProperties: false files: type: array items: type: object properties: file_id: type: string filename: type: string media_kind: type: string enum: - image - video - audio - tag status: type: string enum: - recognizing - recognized - mapped - needs_input - misfit - malformed detected: type: object properties: dimensions: type: string duration: type: string codec: type: string bitrate: type: string frameRate: type: string sampleRate: type: string container: type: string fileSize: type: string tagType: type: string additionalProperties: false suggestion: type: string format_incompatible: type: string preview_url: type: string message: type: string suggestions: type: array items: type: string accepts_context: type: boolean placements: type: array items: type: object properties: placement_id: type: string placement_name: type: string product_name: type: string required: - placement_id - placement_name additionalProperties: false required: - file_id - filename - media_kind - status - detected additionalProperties: false missing_placements: type: array items: type: object properties: placement_id: type: string placement_name: type: string spec_label: type: string product_name: type: string required: - placement_id - placement_name additionalProperties: false available_placements: type: array items: type: object properties: placement_id: type: string placement_name: type: string spec_label: type: string product_name: type: string required: - placement_id - placement_name additionalProperties: false truncated: type: boolean unreadable_placements: type: integer maximum: 9007199254740991 minimum: 1 skipped_files_notice: type: string skipped_files: type: array items: type: string required: - coverage - files 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 ````