> ## Documentation Index > Fetch the complete documentation index at: https://docs.orbit.devotel.io/llms.txt > Use this file to discover all available pages before exploring further. # Select the winning A/B variant > Manually promote one variant as the A/B-test winner, overriding automatic selection. The variant_id must belong to this campaign's variant set; subsequent sends then use the chosen variant. Returns the refreshed A/B results, 422 when the variant does not belong to the campaign, and 404 when the campaign is missing. ## OpenAPI ````yaml /openapi.yaml post /api/v1/campaigns/{id}/ab-select-winner openapi: 3.1.0 info: title: Devotel CPaaS API description: Orbit by Devotel — Communications Platform as a Service API version: 1.0.0 contact: name: Devotel url: https://devotel.io email: support@devotel.io license: name: Proprietary servers: - url: https://api.orbit.devotel.io description: Production security: - Bearer: [] - ApiKey: [] tags: - name: Messages description: >- Send and manage messages across all channels (SMS, WhatsApp, RCS, Email, Viber, etc.) - name: Fax description: >- List and track fax (MMS/T.38) transmissions on Telnyx-backed fax numbers (sending flows through the Messaging API) - name: Agents description: AI agent creation, configuration, and execution - name: Voice description: Voice calls, IVR, conferencing, and SIP trunking - name: OnCall description: On-call rotations and escalation policy planning for incident alerting - name: Webhooks description: Webhook endpoint management and delivery logs - name: Numbers description: Phone number search, provisioning, and configuration - name: Brand Identity description: >- Unified cross-channel brand trust posture (10DLC, toll-free, WhatsApp, RCS, branded calling, number KYC) - name: Contacts description: Contact management, segmentation, and lifecycle tracking - name: Campaigns description: Marketing campaign orchestration and analytics - name: Flows description: Automation flow builder and execution engine - name: Templates description: Message template management and approval workflows - name: Settings description: Organization, channel, and user preference settings - name: Verify description: OTP generation and verification across channels - name: Push description: Push notification delivery via FCM and APNs - name: Integrations description: Third-party service connections and OAuth management - name: CDP description: >- Customer Data Platform — activation surface (CRM object sync, streaming destinations, ad-audience activation) - name: Files description: >- Server-to-server media upload, listing, retrieval, and deletion (signed-URL backed) - name: Commerce description: >- Omnichannel conversational-commerce — persistent cart + checkout state machine, channel-agnostic hosted pay-by-link, native WhatsApp checkout, and AP2-style agent payment mandates. - name: Sync description: >- Real-time shared-state primitive (Twilio Sync parity) — Documents, Maps, Lists, and ephemeral Streams, with change events relayed over the /api/v1/ws/sync WebSocket gateway - name: Risk description: >- Unified cross-channel Trust & Fraud risk scoring — fuses SMS-pumping, URL-reputation, Verify Fraud Guard, and Voice Biometrics signals into one composite verdict queryable before a send or a call. - name: Orby description: >- In-dashboard Orby operator assistant: streamed assistant turns, conversation threads, product knowledge-base search, and the tool-action approval gate. Available to signed-in operators only (dashboard session auth — API-key requests are rejected). paths: /api/v1/campaigns/{id}/ab-select-winner: post: tags: - Campaigns summary: Select the winning A/B variant description: >- Manually promote one variant as the A/B-test winner, overriding automatic selection. The variant_id must belong to this campaign's variant set; subsequent sends then use the chosen variant. Returns the refreshed A/B results, 422 when the variant does not belong to the campaign, and 404 when the campaign is missing. parameters: - schema: type: string in: path name: id required: true requestBody: required: true content: application/json: schema: type: object additionalProperties: false required: - variant_id properties: variant_id: type: string format: uuid description: Id of the variant to mark as the winner. example: variant_id: 4f6c1e2a-9b3d-4c7e-8a1f-2d5b6c7e8f90 responses: '200': description: The refreshed A/B results with the manual winner applied. content: application/json: schema: type: object properties: data: $ref: '#/components/schemas/CampaignAbResults' meta: $ref: '#/components/schemas/ResponseMeta' '404': description: No campaign exists with that id. '422': description: The variant_id does not belong to this campaign's variant set. components: schemas: CampaignAbResults: type: object description: Per-variant A/B metrics for a campaign plus the current winner rollup. properties: campaign_id: type: string ab_test_enabled: type: boolean ab_winner_metric: type: string nullable: true ab_holdout_percent: type: number ab_winner_selected_at: type: string format: date-time nullable: true winner_variant_id: type: string nullable: true total_assigned: type: integer ab_bandit_enabled: type: boolean variants: type: array items: type: object properties: variant: type: object additionalProperties: true delivered_rate: type: number open_rate: type: number click_rate: type: number reply_rate: type: number ResponseMeta: type: object required: - request_id - timestamp additionalProperties: false properties: request_id: type: string description: Unique request identifier (also returned as X-Request-Id header) timestamp: type: string format: date-time docs_url: type: string format: uri nullable: true securitySchemes: Bearer: type: http scheme: bearer bearerFormat: JWT description: Dashboard JWT token from Clerk ApiKey: type: apiKey name: X-API-Key in: header description: Server-to-server API key (dv_live_sk_*) ````