> ## 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. # Stash brought creatives before an advertiser is chosen > Buyer-creative-v2 (feature-flagged). Persists uploaded creatives customer-scoped BEFORE an advertiser is named, so the upload survives across turns. Returns the saved creatives (with ids) in the same shape as the creative-intent picker; pass those ids to getCreativeIntent as `creative_ids` once the advertiser is known. Returns 404 for callers not enrolled in the flag. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml post /creatives/stash 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: /creatives/stash: post: tags: - Creatives summary: Stash brought creatives before an advertiser is chosen description: >- Buyer-creative-v2 (feature-flagged). Persists uploaded creatives customer-scoped BEFORE an advertiser is named, so the upload survives across turns. Returns the saved creatives (with ids) in the same shape as the creative-intent picker; pass those ids to getCreativeIntent as `creative_ids` once the advertiser is known. Returns 404 for callers not enrolled in the flag. operationId: stashBroughtCreatives requestBody: required: true content: application/json: schema: type: object properties: assets: minItems: 1 maxItems: 50 type: array items: type: object properties: data_url: type: string maxLength: 73400320 asset_type: type: string enum: - IMAGE - VIDEO - AUDIO - HTML - VAST name: type: string declared_sizes: maxItems: 30 type: array items: type: object properties: width: type: integer maximum: 9007199254740991 minimum: 1 height: type: integer maximum: 9007199254740991 minimum: 1 required: - width - height required: - data_url required: - assets responses: '200': description: Stash brought creatives before an advertiser is chosen content: application/json: schema: type: object properties: advertiser_name: type: string advertisers: type: array items: type: object properties: advertiser_id: type: string name: type: string required: - advertiser_id - name additionalProperties: false selected_advertiser_id: type: string files: type: array items: type: object properties: file_id: type: string filename: type: string media_kind: type: string enum: - image - video - audio - tag preview_url: type: string required: - file_id - filename - media_kind additionalProperties: false recent_campaigns: type: array items: type: object properties: campaign_id: type: string name: type: string created_label: type: string required: - campaign_id - name additionalProperties: false saved_as: type: string collection_id: type: string skipped_files_notice: type: string skipped_files: type: array items: type: string required: - files - recent_campaigns 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 ````