> ## 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. # Sync audiences > Sync first-party CRM audiences for an account. Processing is asynchronous — returns 202 with an operation ID. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml post /advertisers/{accountId}/audiences/sync 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: /advertisers/{accountId}/audiences/sync: post: tags: - Advertisers summary: Sync audiences description: >- Sync first-party CRM audiences for an account. Processing is asynchronous — returns 202 with an operation ID. operationId: syncAudiences requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SyncAudiencesBody' responses: '202': description: Sync audiences content: application/json: schema: $ref: '#/components/schemas/SyncAudiencesResponse' '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: SyncAudiencesBody: description: Sync audience data into Scope3 type: object properties: audiences: description: Audiences to sync minItems: 1 type: array items: $ref: '#/components/schemas/AudienceItem' deleteMissing: description: When true, audiences not in this request are marked as deleted. type: boolean pushNotificationConfig: type: object properties: url: type: string operation_id: type: string minLength: 1 maxLength: 255 pattern: ^[A-Za-z0-9_.:-]{1,255}$ token: type: string minLength: 16 maxLength: 4096 authentication: type: object properties: schemes: type: array items: anyOf: - type: string enum: - Bearer - type: string enum: - HMAC-SHA256 credentials: type: string minLength: 32 required: - schemes - credentials additionalProperties: {} required: - url additionalProperties: {} required: - audiences SyncAudiencesResponse: description: Audience sync accepted for async processing type: object properties: success: type: boolean accountId: description: >- Advertiser ID (numeric string, e.g. "25") — same as the path parameter example: '25' type: string operationId: description: Batch operation UUID for tracking async processing type: string format: uuid pattern: >- ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$ taskId: description: >- Task ID for polling progress via GET /tasks/{taskId}. Same value as operationId. type: string format: uuid pattern: >- ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$ required: - success - accountId - operationId - taskId additionalProperties: false ErrorResponse: description: Standard error response type: object properties: data: type: string nullable: true enum: - null error: $ref: '#/components/schemas/ApiError' required: - data - error additionalProperties: false AudienceItem: description: Audience to sync with member changes type: object properties: audienceId: description: Buyer's identifier for this audience. Used in targeting overlays. type: string minLength: 1 maxLength: 255 name: description: Human-readable name type: string maxLength: 255 add: description: Members to add to this audience maxItems: 100000 type: array items: type: object properties: externalId: description: Unique identifier for this member within the audience type: string minLength: 1 hashedEmail: description: SHA-256 hash of lowercase, trimmed email (64-char hex) example: a1b2c3d4e5f6... type: string pattern: ^[0-9a-f]{64}$ hashedPhone: description: SHA-256 hash of E.164-formatted phone number (64-char hex) example: f6e5d4c3b2a1... type: string pattern: ^[0-9a-f]{64}$ uids: description: Universal IDs for user matching minItems: 1 type: array items: type: object properties: type: description: Universal ID type (rampid, uid2, maid, etc.) type: string minLength: 1 value: description: Universal ID value type: string minLength: 1 required: - type - value required: - externalId remove: description: Members to remove by external ID maxItems: 100000 type: array items: $ref: '#/components/schemas/RemoveMember' delete: description: When true, delete this audience entirely type: boolean consentBasis: description: GDPR lawful basis for processing this audience type: string enum: - consent - legitimate_interest - contract - legal_obligation required: - audienceId ApiError: description: Structured error object type: object properties: code: description: Machine-readable error code type: string message: description: Human-readable error message type: string field: description: Field path associated with the error type: string details: description: Additional error context type: object additionalProperties: {} required: - code - message additionalProperties: false RemoveMember: description: Member to remove from the audience type: object properties: externalId: description: Unique identifier for this member within the audience type: string minLength: 1 hashedEmail: description: SHA-256 hash of lowercase, trimmed email (64-char hex) example: a1b2c3d4e5f6... type: string pattern: ^[0-9a-f]{64}$ hashedPhone: description: SHA-256 hash of E.164-formatted phone number (64-char hex) example: f6e5d4c3b2a1... type: string pattern: ^[0-9a-f]{64}$ uids: description: Universal IDs for user matching minItems: 1 type: array items: type: object properties: type: description: Universal ID type (rampid, uid2, maid, etc.) type: string minLength: 1 value: description: Universal ID value type: string minLength: 1 required: - type - value required: - externalId securitySchemes: bearerAuth: type: http scheme: bearer description: API key or access token ````