> ## Documentation Index > Fetch the complete documentation index at: https://docs.usenexio.com/llms.txt > Use this file to discover all available pages before exploring further. # Resend Webhook Delivery > Start a fresh audited retry generation for a dead-letter delivery. ## OpenAPI ````yaml POST /api/v1/webhooks/{endpointID}/deliveries/{deliveryID}/resend openapi: 3.1.0 info: title: Nexio API version: '1.0' description: | Nexio agentic infrastructure API. Configure engines for placement, entity analysis, and other patterns. Submit runs, poll for results, or subscribe to signed webhook callbacks. contact: email: support@usenexio.com url: https://docs.usenexio.com servers: - url: https://api.usenexio.com description: Production security: - BearerAuth: [] tags: - name: EngineManagement description: Create, configure, and manage inference engines. - name: Engines description: Engine-scoped endpoints for submitting runs and retrieving results. - name: Runs description: Retrieve and reconcile submitted runs. - name: Environments description: Isolated tenancy scopes under your org (one live plus non-live sandboxes). - name: Webhooks description: Manage webhook endpoints for push-based delivery of terminal run events. paths: /api/v1/webhooks/{endpointID}/deliveries/{deliveryID}/resend: post: tags: - Webhooks summary: Resend Dead-Letter Webhook Delivery description: | Start a fresh audited six-attempt generation for a `dead_letter` delivery. The stable delivery ID does not change. The endpoint must be active. Queue insertion is an optimization after the durable database transition, so the sweeper recovers an enqueue failure. Scoped partner keys require `webhooks:manage`. operationId: resendWebhookDelivery parameters: - $ref: '#/components/parameters/EndpointID' - $ref: '#/components/parameters/DeliveryID' responses: '200': description: A new resend generation is pending. content: application/json: schema: $ref: '#/components/schemas/WebhookResendResponse' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '409': description: >- Delivery is not dead-lettered or its endpoint is inactive or deleted. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: delivery_not_resendable message: >- Delivery is not in dead_letter status or endpoint is inactive/deleted '429': $ref: '#/components/responses/RateLimited' '503': $ref: '#/components/responses/AuthUnavailable' components: parameters: EndpointID: name: endpointID in: path required: true description: Webhook endpoint UUID. schema: type: string format: uuid DeliveryID: name: deliveryID in: path required: true description: Webhook delivery UUID. schema: type: string format: uuid schemas: WebhookResendResponse: type: object additionalProperties: false required: - delivery_id - status - resend_generation properties: delivery_id: type: string format: uuid status: type: string const: pending resend_generation: type: integer minimum: 1 Error: type: object required: - code - message properties: code: type: string description: | Stable snake_case error identifier. Safe to match programmatically. Known codes: `invalid_request`, `invalid_input`, `unauthorized`, `auth_unavailable`, `rate_limited`, `missing_run_id`, `invalid_run_id`, `run_not_found`, `invalid_offerings`, `missing_input`, `queue_unreachable`, `engine_not_found`, `engine_slug_conflict`, `engine_archived`, `invalid_engine_type`, `validation_error`, `webhook_not_found`, `webhook_limit_exceeded`, `invalid_url`, `invalid_events`, `invalid_description`, `invalid_auth_token`, `missing_endpoint_id`, `invalid_endpoint_id`, `missing_delivery_id`, `invalid_delivery_id`, `delivery_not_found`, `delivery_not_resendable`, `insufficient_capability`, `engine_version_required`, `engine_version_exact_required`, `engine_version_not_found`, `engine_version_invalid_format`, `engine_version_draft_requires_sandbox_key`, `engine_version_none_released`, `test_scenario_sandbox_only`, `test_scenario_forbidden`, `test_scenario_exact_version_required`, `test_scenario_version_not_supported`, `invalid_test_scenario`, `request_bound_exceeded`, and `run_cap_exceeded`. message: type: string description: Human-readable error message. May change between versions. details: description: | Optional request-specific details. Request-bound failures use the `RequestBoundDetails` object. Validation failures may use an array of field issues or another documented object. responses: BadRequest: description: Invalid request. content: application/json: schema: $ref: '#/components/schemas/Error' examples: invalidRequest: summary: Malformed JSON value: code: invalid_request message: Request body is not valid JSON invalidInput: summary: Input validation failed value: code: invalid_input message: Input failed validation details: - field: input.address.state message: address.state is required for placement runs. invalidOfferings: summary: Placement run missing offerings value: code: invalid_offerings message: Inline offerings failed validation details: - field: offerings message: >- Offerings are required for placement runs. Pass provider offerings in the top-level offerings array. Unauthorized: description: Missing or invalid API key. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: unauthorized message: Missing or invalid API key Forbidden: description: Scoped key does not have the capability required by this operation. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: insufficient_capability message: API key does not have permission for this action RateLimited: description: Rate limit exceeded. Retry after the window resets. headers: Retry-After: description: Seconds until the rate limit window resets. schema: type: integer content: application/json: schema: $ref: '#/components/schemas/Error' example: code: rate_limited message: Rate limit exceeded AuthUnavailable: description: API key authentication is temporarily unavailable. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: auth_unavailable message: API key authentication is temporarily unavailable securitySchemes: BearerAuth: type: http scheme: bearer description: | Send the credential as `Authorization: Bearer `. Scoped partner credentials use the exclusive `nxsk_v1_...` namespace. Each scoped key is bound at issuance to one organization, one canonical named environment, an explicit engine set, and a least-privilege capability set. A malformed, unknown, rotated, or revoked `nxsk_` key fails closed and is never retried as a legacy key. Capabilities used by this API are `runs:write`, `runs:read`, `engines:read`, `webhooks:manage`, `runs:defensibility:read`, and `runs:test`. Operation descriptions name the required capability. Grandfathered `nx_live_...` and `nx_test_...` keys retain their existing broad access during the compatibility window. ````