> ## Documentation Index > Fetch the complete documentation index at: https://checkfu.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Redeliver a failed webhook delivery > Requeue one dead-lettered (`failed`) delivery from its owning Session. Checkfu preserves the original delivery id, event id, event type, per-Session sequence, and event timestamp; it schedules a new signed attempt and never fabricates a replacement event. The endpoint must be active, the delivery must still be inside the 30-day diagnostic window, and a non-empty Idempotency-Key is required for safe retries. Checkfu support posture: alpha; hosted. Required evidence journey: webhook-delivery. Deployment-specific readiness and the latest proven release are available from GET /v1/support/capabilities. ## OpenAPI ````yaml /openapi.json post /v1/webhook-endpoints/{id}/deliveries/{deliveryId}/redeliver openapi: 3.1.0 info: title: Checkfu API version: '2026-08-27' description: >- Authentication is declared per operation: API-key, runtime, or connector bearer; Automation signature; or credential-free pairing redemption. Every general Checkfu REST request requires the dated `Checkfu-Version` header (one of: 2026-08-27); the three MCP JSON-RPC transports use `MCP-Protocol-Version`, A2A uses `A2A-Version`, and the provider OAuth callback carries neither Checkfu header. API keys resolve one Workspace without a request selector; authenticated responses identify it with `Checkfu-Workspace-Id`. servers: - url: https://api.checkfu.com security: - bearerAuth: [] tags: - name: organizations - name: sourceRepositories - name: tenants - name: workspaces - name: principals - name: principalGroups - name: principalAccessCredentials - name: apiKeys - name: agents - name: harnesses - name: harnessRuntime - name: computerProfiles - name: permissionAssignments - name: actionPolicies - name: files - name: memoryStores - name: dreams - name: modelCredentials - name: modelRoutingProfiles - name: blueprintInstallations - name: toolSources - name: skills - name: skillSources - name: agentSources - name: skillProposals - name: instructionProposals - name: catalog - name: concepts - name: support - name: connections - name: connectionVaults - name: connectionAssignments - name: connectedRuntimes - name: projects - name: collaboration - name: automationGraphs - name: automations - name: actionApprovals - name: standingApprovals - name: usage - name: models - name: outcomes - name: budgets - name: billing - name: sessions - name: audit - name: sessionExports - name: runs - name: runnerPools - name: transcripts - name: sessionWatches - name: sessionHandoffs - name: sessionCapsules - name: sessionTrajectories - name: webhookEndpoints - name: integrationGateway - name: agentDeployments - name: workEnvironments - name: computers - name: computerScreens - name: computerBrowserObservations - name: computerBrowserActions - name: environments - name: vaults - name: apiMcp - name: a2a paths: /v1/webhook-endpoints/{id}/deliveries/{deliveryId}/redeliver: post: tags: - webhookEndpoints summary: Redeliver a failed webhook delivery description: >- Requeue one dead-lettered (`failed`) delivery from its owning Session. Checkfu preserves the original delivery id, event id, event type, per-Session sequence, and event timestamp; it schedules a new signed attempt and never fabricates a replacement event. The endpoint must be active, the delivery must still be inside the 30-day diagnostic window, and a non-empty Idempotency-Key is required for safe retries. Checkfu support posture: alpha; hosted. Required evidence journey: webhook-delivery. Deployment-specific readiness and the latest proven release are available from GET /v1/support/capabilities. operationId: webhookEndpoints.redeliverWebhookDelivery parameters: - name: id in: path schema: $ref: '#/components/schemas/WebhookEndpointId' required: true - name: deliveryId in: path schema: $ref: '#/components/schemas/WebhookDeliveryId' required: true - name: checkfu-version in: header schema: type: string enum: - '2026-08-27' required: true - name: idempotency-key in: header schema: type: string allOf: - maxLength: 255 - minLength: 1 required: true responses: '202': description: Success content: application/json: schema: type: object properties: status: type: string enum: - queued delivery_id: $ref: '#/components/schemas/WebhookDeliveryId' endpoint_id: $ref: '#/components/schemas/WebhookEndpointId' event_id: $ref: '#/components/schemas/EventId' session_id: anyOf: - $ref: '#/components/schemas/SessionId' - type: 'null' attempts: type: integer allOf: - exclusiveMinimum: 0 queued_at: type: string required: - status - delivery_id - endpoint_id - event_id - session_id - attempts - queued_at additionalProperties: false headers: checkfu-workspace-id: description: The Workspace resolved from the authenticated bearer credential. required: true schema: $ref: '#/components/schemas/WorkspaceId' '400': description: Typed Checkfu wire error content: application/json: schema: type: object required: - error properties: error: type: object properties: type: type: string enum: - validation.malformed message: type: string more: type: string enum: - >- https://docs.checkfu.com/reference/errors#validation-malformed description: >- Stable public documentation and remedy for this error type. required: - type - message - more additionalProperties: false additionalProperties: false '401': description: Typed Checkfu wire error content: application/json: schema: type: object required: - error properties: error: type: object required: - type - message - more properties: type: type: string enum: - auth.invalid_key message: type: string more: type: string enum: - >- https://docs.checkfu.com/reference/errors#auth-invalid-key description: >- Stable public documentation and remedy for this error type. additionalProperties: false additionalProperties: false '403': description: >- The organization, tenant, or workspace backing this key is administratively disabled. | Deployment governance or retention policy denied the request. content: application/json: schema: anyOf: - type: object required: - error properties: error: type: object properties: type: type: string enum: - auth.disabled_tenancy message: type: string more: type: string enum: - >- https://docs.checkfu.com/reference/errors#auth-disabled-tenancy description: >- Stable public documentation and remedy for this error type. required: - type - message - more additionalProperties: false additionalProperties: false - $ref: '#/components/schemas/PolicyDeniedError' '404': description: >- The requested resource does not exist in the resolved deployment boundary. content: application/json: schema: $ref: '#/components/schemas/ValidationNotFoundError' '409': description: >- The operation is illegal for the resource's current lifecycle state. | An idempotent mutation conflicts with a completed or in-progress request for the same key. content: application/json: schema: anyOf: - $ref: '#/components/schemas/RuntimeInvalidTransitionError' - $ref: '#/components/schemas/IdempotencyConflictError' '429': description: Typed Checkfu wire error headers: retry-after: description: >- Delay in seconds for rate limits or deployment quotas with a known release or UTC reset boundary required: false schema: type: integer minimum: 1 content: application/json: schema: type: object required: - error properties: error: type: object required: - type - message - more properties: type: type: string enum: - budget.exceeded message: type: string more: type: string enum: - >- https://docs.checkfu.com/reference/errors#budget-exceeded description: >- Stable public documentation and remedy for this error type. additionalProperties: false additionalProperties: false '500': description: >- An unexpected internal failure occurred; the message contains an opaque incident reference. content: application/json: schema: $ref: '#/components/schemas/RuntimeInternalError' security: - bearerAuth: [] components: schemas: WebhookEndpointId: type: string allOf: - pattern: ^whe_[0-9a-f]{32}$ WebhookDeliveryId: type: string allOf: - pattern: ^wdel_[0-9a-f]{32}$ EventId: type: string allOf: - pattern: ^evt_[0-9a-f]{32}$ SessionId: type: string allOf: - pattern: ^sess_[0-9a-f]{32}$ WorkspaceId: type: string allOf: - pattern: ^wrkspc_[0-9a-f]{32}$ PolicyDeniedError: type: object properties: error: type: object properties: type: type: string enum: - policy.denied message: type: string more: type: string enum: - https://docs.checkfu.com/reference/errors#policy-denied description: Stable public documentation and remedy for this error type. required: - type - message - more additionalProperties: false required: - error additionalProperties: false description: Deployment governance or retention policy denied the request. ValidationNotFoundError: type: object properties: error: type: object properties: type: type: string enum: - validation.not_found message: type: string more: type: string enum: - https://docs.checkfu.com/reference/errors#validation-not-found description: Stable public documentation and remedy for this error type. required: - type - message - more additionalProperties: false required: - error additionalProperties: false description: >- The requested resource does not exist in the resolved deployment boundary. RuntimeInvalidTransitionError: type: object properties: error: type: object properties: type: type: string enum: - runtime.invalid_transition message: type: string more: type: string enum: - >- https://docs.checkfu.com/reference/errors#runtime-invalid-transition description: Stable public documentation and remedy for this error type. required: - type - message - more additionalProperties: false required: - error additionalProperties: false description: The operation is illegal for the resource's current lifecycle state. IdempotencyConflictError: anyOf: - $ref: '#/components/schemas/ValidationIdempotencyConflictError' - $ref: '#/components/schemas/ValidationIdempotencyInProgressError' description: >- An idempotent mutation conflicts with a completed or in-progress request for the same key. RuntimeInternalError: type: object properties: error: type: object properties: type: type: string enum: - runtime.internal message: type: string more: type: string enum: - https://docs.checkfu.com/reference/errors#runtime-internal description: Stable public documentation and remedy for this error type. required: - type - message - more additionalProperties: false required: - error additionalProperties: false description: >- An unexpected internal failure occurred; the message contains an opaque incident reference. ValidationIdempotencyConflictError: type: object properties: error: type: object properties: type: type: string enum: - validation.idempotency_conflict message: type: string more: type: string enum: - >- https://docs.checkfu.com/reference/errors#validation-idempotency-conflict description: Stable public documentation and remedy for this error type. required: - type - message - more additionalProperties: false required: - error additionalProperties: false description: The Idempotency-Key is already bound to a different request. ValidationIdempotencyInProgressError: type: object properties: error: type: object properties: type: type: string enum: - validation.idempotency_in_progress message: type: string more: type: string enum: - >- https://docs.checkfu.com/reference/errors#validation-idempotency-in-progress description: Stable public documentation and remedy for this error type. required: - type - message - more additionalProperties: false required: - error additionalProperties: false description: >- An identical idempotent request is still in progress and may be retried later. securitySchemes: bearerAuth: type: http scheme: bearer ````