> ## Documentation Index > Fetch the complete documentation index at: https://docs.fourdos.dev/llms.txt > Use this file to discover all available pages before exploring further. # Mark a claim's reward code used > For the partner honouring the code, so the same code cannot be applied twice: it sets `code_used_at` once, and a second call is refused. Call it before you charge. Send an `Idempotency-Key` tied to one checkout attempt to make a retry of that attempt replay the original response. Member sessions are refused. ## OpenAPI ````yaml https://api.develop.fourdos.dev/openapi/partner.json post /v1/users/{userId}/redemptions/{redemptionId}/use openapi: 3.1.0 info: title: 4D OS Partner API version: 0.1.0 description: >- REST API for 4D OS partners. Authenticate with your organization API key: `Authorization: Bearer `. Requests and responses are JSON with `snake_case` field names. Errors share one envelope: `{ "error": { "code", "status", "message", "details"? } }`. Mutating endpoints that declare it accept an `Idempotency-Key` header so retries are safe. Bulk-migrating members? See the [Migrating to 4D guide](https://docs.fourdos.dev/walkthroughs/migrate-existing-members) for the canonical import schema, a worked example, and the `/v1/imports` sequence. servers: - url: https://api.develop.fourdos.dev security: - partnerApiKey: [] tags: - name: Users description: Create, read, and manage users and their org membership - name: Imports description: Bulk member import jobs (staging → validate → commit) - name: Consents description: Record, list and withdraw a member's consents and agreements - name: Rewards description: A member's reward catalog, claims and reward codes - name: XP description: >- A member's balance, earning headroom, expiry and boosts, and what each event pays - name: Tiers description: Read your organization's tier ladder - name: Webhooks description: Register webhook endpoints. Deliveries are not sent yet. - name: Events description: Refetch your organization's events from the last 30 days - name: API keys description: Issue, list, and revoke server-side organization API keys - name: Modules description: >- Publish private modules, install visible modules, and manage their credentials - name: Ingest description: Receive signed native events from an installed module - name: Engagement description: Browser event tracking (publishable keys) and tracking-key management - name: Revenue description: Report sales and refunds for the club's revenue dashboards - name: Ad delivery description: Fill a club site's ad slots, for anonymous or signed-in fans - name: Ad entries description: Fans entering a sponsor's draw, reported by the club's backend paths: /v1/users/{userId}/redemptions/{redemptionId}/use: post: tags: - Rewards summary: Mark a claim's reward code used description: >- For the partner honouring the code, so the same code cannot be applied twice: it sets `code_used_at` once, and a second call is refused. Call it before you charge. Send an `Idempotency-Key` tied to one checkout attempt to make a retry of that attempt replay the original response. Member sessions are refused. operationId: useRedemptionCode parameters: - name: userId in: path required: true schema: type: string - name: redemptionId in: path required: true schema: type: string - name: Idempotency-Key in: header required: false description: >- Optional. The same key for the same claim replays the original response. schema: type: string responses: '200': description: The claim with `code_used_at` set content: application/json: schema: $ref: '#/components/schemas/Redemption' '401': description: '`UNAUTHORIZED`: no valid credential' content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: >- `FORBIDDEN`: the caller is a member session. `CONSENT_REQUIRED`: an admin session still owes an agreement (`details.scopes`) content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: '`NOT_FOUND`: no such claim for this member in your organization' content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: >- `REWARD_CODE_USED`: the code was already marked used (`details.code_used_at`). `IDEMPOTENCY_CONFLICT`: the key was already used for a different request content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: '`VALIDATION_ERROR`: the claim''s reward issued no code' content: application/json: schema: $ref: '#/components/schemas/Error' security: - partnerApiKey: [] - adminSession: [] components: schemas: Redemption: type: object properties: id: type: string user_id: type: string org_id: type: string reward_id: type: string amount: type: string description: A non-negative integer as a decimal string. status: type: string enum: - pending - burned - fulfilled - failed burn_ledger_entry_id: type: - string - 'null' onchain_job_id: type: - string - 'null' fulfilled_at: type: - string - 'null' format: date-time code: type: - string - 'null' description: >- The single-use code a code reward issued; null for every other reward. code_used_at: type: - string - 'null' format: date-time description: Null while the code is still usable. created_at: type: string format: date-time required: - id - user_id - org_id - reward_id - amount - status - burn_ledger_entry_id - onchain_job_id - fulfilled_at - code - code_used_at - created_at Error: type: object properties: error: type: object properties: code: type: string status: type: integer message: type: string details: type: object additionalProperties: true required: - code - status - message required: - error securitySchemes: partnerApiKey: type: http scheme: bearer description: >- Organization API key (`org_...`) sent as `Authorization: Bearer `. Keys are scoped to one organization; every request operates within that tenant. adminSession: type: http scheme: bearer description: >- Partner admin session token sent as `Authorization: Bearer `. Obtained by signing in (console or the email OTP endpoints) and completing the second factor; see the Authentication page. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.