> ## 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. # Promote advertiser creatives into the library shelf > Buyer-creative-v2 (feature-flagged). Promotes advertiser creatives into the durable creative library ("the shelf") with a role — `evergreen` (serve-ready, reusable across campaigns) or `reference` (a generation input, not served). Identify the creatives by `creative_ids` or by `collection_id`. No campaign is required. Returns 404 for callers not enrolled in the flag. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml post /advertisers/{advertiserId}/creatives/save-to-library 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: /advertisers/{advertiserId}/creatives/save-to-library: post: tags: - Creatives summary: Promote advertiser creatives into the library shelf description: >- Buyer-creative-v2 (feature-flagged). Promotes advertiser creatives into the durable creative library ("the shelf") with a role — `evergreen` (serve-ready, reusable across campaigns) or `reference` (a generation input, not served). Identify the creatives by `creative_ids` or by `collection_id`. No campaign is required. Returns 404 for callers not enrolled in the flag. operationId: saveCreativesToLibrary parameters: - in: path name: advertiserId schema: description: Advertiser ID type: string minLength: 1 required: true description: Advertiser ID requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SaveCreativesToLibraryBody' responses: '200': description: Promote advertiser creatives into the library shelf content: application/json: schema: $ref: '#/components/schemas/SaveCreativesToLibraryResponse' '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: SaveCreativesToLibraryBody: description: >- Promote advertiser creatives into the library ("the shelf") with a role. Identify the creatives by creative_ids or by collection_id. type: object properties: creative_ids: description: >- Creative manifest IDs to promote into the advertiser library. Provide this or collection_id. type: array items: type: string minLength: 1 collection_id: description: >- A saved collection (e.g. the one grouped at creative-intent time) whose creative members are all promoted. Provide this or creative_ids — collection_id scales to any number of creatives. type: string minLength: 1 role: description: >- Library role to assign: evergreen (serve-ready) or reference (generation input). allOf: - $ref: '#/components/schemas/CreativeRole' required: - role SaveCreativesToLibraryResponse: description: Result of promoting creatives into the advertiser library. type: object properties: role: $ref: '#/components/schemas/CreativeRole' updated: description: Creative manifest IDs whose role was set. type: array items: type: string manifests: description: >- The advertiser library after the save (promoted creatives only), so the result can render the shelf. type: array items: $ref: '#/components/schemas/CreativeManifestSummary' total: description: Total promoted creatives in the advertiser library. type: integer minimum: 0 maximum: 9007199254740991 required: - role - updated - manifests - total additionalProperties: false 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 CreativeRole: description: >- Advertiser creative-library role: evergreen (serve-ready, reusable across campaigns) or reference (a generation input, not served). Absent for flight-specific creatives. type: string enum: - evergreen - reference CreativeManifestSummary: description: >- Compact creative-manifest view returned by list endpoints. Use `get_creative` for the full resource. type: object properties: creative_id: description: Creative manifest ID type: string campaign_id: description: Campaign ID (omitted for advertiser-level masters) type: string name: description: Manifest name type: string format_id: description: ADCP format identifier type: object properties: id: type: string agent_url: type: string width: type: number height: type: number duration_ms: type: number required: - id - agent_url additionalProperties: {} format_kind: description: AdCP 3.1 canonical format kind (e.g. image_carousel, video_hosted) type: string template_id: description: Creative template used for this manifest type: string brand_domain: description: Brand domain (auto-resolved) type: string preview_url: description: URL to preview the processed creative (processed HTML hosted in GCS) type: string format: uri requires_upgrade: description: >- True when this creative has no format_kind and must be upgraded before it can be assigned to new media buys. Call POST .../upgrade to set format_kind and clear this flag. type: boolean reuse_count: description: >- Number of campaigns this creative is actively attached to. A reuse signal for the advertiser library (returned on the advertiser-scoped list); omitted on single-manifest reads. type: integer minimum: 0 maximum: 9007199254740991 creative_role: description: >- Advertiser-library role (evergreen or reference). Absent for flight-specific creatives that live on their campaign. allOf: - $ref: '#/components/schemas/CreativeRole' creative_source: description: >- Provenance of the creative (uploaded/generated/connected). Today always "uploaded". allOf: - $ref: '#/components/schemas/CreativeSource' platform_links: description: >- Provider/sales-agent creative identifiers captured from sync_creatives for round-trip comparison. type: array items: $ref: '#/components/schemas/CreativeManifestPlatformLink' created_at: description: Created timestamp type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ updated_at: description: Updated timestamp type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ asset_count: description: >- Number of uploaded assets in this manifest. Replaces the embedded `assets[]` array on summary rows. example: 3 type: integer minimum: 0 maximum: 9007199254740991 primary_asset_type: description: >- The dominant media asset type (VIDEO > AUDIO > IMAGE/HTML) — lets clients classify a creative by medium even when format_kind is absent (e.g. a bare upload). Omitted when the manifest has no media asset. type: string enum: - IMAGE - VIDEO - AUDIO - HTML - JAVASCRIPT - CSS - TEXT - URL - VAST - FONT - LOGO - DOCUMENT sync_status: description: >- Compact sync status across sales agents. Use `get_creative` for the full sync metadata (including `last_synced_at`). type: object properties: synced: description: True when the manifest is synced with at least one agent type: boolean agent_count: description: Number of sales agents the manifest is synced with type: integer minimum: -9007199254740991 maximum: 9007199254740991 required: - synced - agent_count additionalProperties: false target_format_ids: description: >- Additional format IDs this creative covers beyond its primary format_id. type: array items: type: object properties: id: type: string agent_url: type: string width: type: number height: type: number duration_ms: type: number required: - id - agent_url additionalProperties: {} placements: description: >- Resolved placements this creative maps to (primary + target formats), named against the campaign's required placements. Populated by the campaign creative-manifest list. type: array items: type: object properties: placement_id: type: string placement_name: type: string required: - placement_id - placement_name additionalProperties: false required: - creative_id - name - created_at - updated_at - asset_count 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 CreativeSource: description: >- Origin of the creative: uploaded (bring-your-own), generated (by a creative agent), or connected (from a 3p platform). type: string enum: - uploaded - generated - connected CreativeManifestPlatformLink: description: >- Readback linkage between a campaign creative and the sales agent/provider creative created during sync. type: object properties: agent_id: description: Stable ADCP sales-agent identifier used for the sync. type: string agent_name: description: Human-readable sales-agent or platform adapter name. type: string platform_id: description: >- Provider-assigned creative identifier returned by sync_creatives, when available. type: string status: description: Latest sync status reported for this agent. type: string approval_status: description: Latest provider or seller approval status, when available. type: string synced_at: description: Timestamp of the latest completed sync. type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ required: - agent_id - agent_name - status additionalProperties: false securitySchemes: bearerAuth: type: http scheme: bearer description: API key or access token ````