> ## 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. # Refresh a hosted buyer-agent runtime token > The deployment-authenticated hosted runtime orchestrator replaces a short-lived identity-only runtime token for an active buyer-agent principal. It has the same claim restrictions and lifetime as minting. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml post /buyer-agent-principals/{principalId}/runtime-token/refresh 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: /buyer-agent-principals/{principalId}/runtime-token/refresh: servers: - url: https://api.interchange.io/api/v2 description: Production server post: tags: - Buyer Agent Principals summary: Refresh a hosted buyer-agent runtime token description: >- The deployment-authenticated hosted runtime orchestrator replaces a short-lived identity-only runtime token for an active buyer-agent principal. It has the same claim restrictions and lifetime as minting. operationId: refreshBuyerAgentRuntimeToken parameters: - in: path name: principalId schema: type: string pattern: ^prin_[A-Za-z0-9_-]{32}$ required: true requestBody: required: true content: application/json: schema: type: object properties: installationId: type: string minLength: 1 maxLength: 255 generation: type: string minLength: 1 maxLength: 255 additionalProperties: false responses: '200': description: Refresh a hosted buyer-agent runtime token content: application/json: schema: $ref: '#/components/schemas/BuyerAgentRuntimeTokenApiResponse' '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 the hosted runtime orchestrator, or the principal is suspended or retired. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: The buyer-agent principal does not exist. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '503': description: Runtime token signing is unavailable. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - bearerAuth: [] hostedBuyerAgentOrchestrator: [] components: schemas: BuyerAgentRuntimeTokenApiResponse: type: object properties: data: type: object properties: accessToken: type: string minLength: 1 tokenType: type: string enum: - Bearer expiresAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ required: - accessToken - tokenType - expiresAt additionalProperties: false error: type: string nullable: true enum: - null required: - data - error additionalProperties: false 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 hostedBuyerAgentOrchestrator: type: apiKey in: header name: X-Hosted-Buyer-Agent-Orchestrator description: Deployment-injected hosted runtime orchestrator credential. ````