> ## Documentation Index > Fetch the complete documentation index at: https://docs.monaco.com/llms.txt > Use this file to discover all available pages before exploring further. # List Delivery Attempts > Returns one row per HTTP attempt made against this subscription's endpoint, newest first, so a failing integration can be diagnosed without asking support. Retries appear as separate rows sharing a `source_event_id`, numbered by `attempt`. `error` carries the returned status or the transport error's class and message. The response body your endpoint returned is never stored or returned, and neither is the signing secret or the delivered payload. Scoped to the calling org: a subscription belonging to another org is a 404, and a deleted subscription keeps its history. **Error codes** | `error.code` | HTTP | Cause | What to do | | --- | --- | --- | --- | | `not_found` | 422 | No subscription with this id exists in the calling org. | Check the id; a deleted subscription is never returned. | ## OpenAPI ````yaml https://api.monaco.com/openapi.json get /v1/webhooks/subscriptions/{subscription_id}/deliveries openapi: 3.1.0 info: title: Monaco Public API description: Public API for Monaco version: 1.0.0 servers: - url: https://api.monaco.com security: [] paths: /v1/webhooks/subscriptions/{subscription_id}/deliveries: get: tags: - Webhooks summary: List Delivery Attempts description: >- Returns one row per HTTP attempt made against this subscription's endpoint, newest first, so a failing integration can be diagnosed without asking support. Retries appear as separate rows sharing a `source_event_id`, numbered by `attempt`. `error` carries the returned status or the transport error's class and message. The response body your endpoint returned is never stored or returned, and neither is the signing secret or the delivered payload. Scoped to the calling org: a subscription belonging to another org is a 404, and a deleted subscription keeps its history. **Error codes** | `error.code` | HTTP | Cause | What to do | | --- | --- | --- | --- | | `not_found` | 422 | No subscription with this id exists in the calling org. | Check the id; a deleted subscription is never returned. | operationId: list_webhook_delivery_attempts parameters: - name: subscription_id in: path required: true schema: type: string format: uuid title: Subscription Id - name: page in: query required: false schema: type: integer minimum: 1 description: Page number (1-indexed) default: 1 title: Page description: Page number (1-indexed) - name: page_size in: query required: false schema: type: integer maximum: 100 minimum: 1 description: Attempts per page default: 25 title: Page Size description: Attempts per page - name: status in: query required: false schema: anyOf: - $ref: '#/components/schemas/WebhookDeliveryStatus' - type: 'null' description: Return only attempts with this status title: Status description: Return only attempts with this status - name: source_event_id in: query required: false schema: anyOf: - type: string - type: 'null' description: Return only attempts that delivered this envelope id title: Source Event Id description: Return only attempts that delivered this envelope id responses: '200': description: Successful Response content: application/json: schema: $ref: >- #/components/schemas/PublicListResponse_WebhookDeliveryAttemptResponse_ 4XX: description: Client error content: application/json: schema: $ref: '#/components/schemas/PublicErrorResponse' components: schemas: WebhookDeliveryStatus: type: string enum: - succeeded - failed title: WebhookDeliveryStatus PublicListResponse_WebhookDeliveryAttemptResponse_: properties: data: items: $ref: '#/components/schemas/WebhookDeliveryAttemptResponse' type: array title: Data pagination: $ref: '#/components/schemas/PaginationInfo' meta: $ref: '#/components/schemas/ResponseMeta' type: object required: - data - pagination title: PublicListResponse[WebhookDeliveryAttemptResponse] PublicErrorResponse: properties: error: $ref: '#/components/schemas/ErrorDetail' type: object required: - error title: PublicErrorResponse WebhookDeliveryAttemptResponse: properties: id: type: string format: uuid title: Id description: Identifier of this attempt subscription_id: type: string format: uuid title: Subscription Id source_event_id: type: string title: Source Event Id description: The envelope `id` this attempt delivered; equal across its retries examples: - 01994f2c-7a10-7b3e-9d21-6f0a5c8e1234 trigger_key: type: string title: Trigger Key examples: - deal.stage_changed attempt: type: integer title: Attempt description: 1 for the first attempt, then 2, 3 and 4 for the retries examples: - 1 status: type: string title: Status description: '`succeeded` or `failed`' examples: - failed response_code: anyOf: - type: integer - type: 'null' title: Response Code description: >- HTTP status the endpoint returned, or null if no response was received examples: - 404 duration_ms: type: integer title: Duration Ms description: Wall time of the attempt in milliseconds examples: - 184 error: anyOf: - type: string - type: 'null' title: Error description: >- Why the attempt failed: the returned status, or the transport error's class and message. Never contains the response body. examples: - Endpoint returned HTTP 404 created_at: type: string format: date-time title: Created At type: object required: - id - subscription_id - source_event_id - trigger_key - attempt - status - duration_ms - created_at title: WebhookDeliveryAttemptResponse PaginationInfo: properties: page: type: integer title: Page description: Current page number examples: - 1 page_size: type: integer title: Page Size description: Number of results per page examples: - 25 total_count: type: integer title: Total Count description: Total number of matching records examples: - 142 total_pages: type: integer title: Total Pages description: Total number of pages examples: - 6 type: object required: - page - page_size - total_count - total_pages title: PaginationInfo ResponseMeta: properties: timestamp: type: string format: date-time title: Timestamp description: Server timestamp of the response type: object title: ResponseMeta ErrorDetail: properties: code: type: string title: Code description: Machine-readable error code examples: - not_found message: type: string title: Message description: Human-readable error message examples: - Resource not found type: object required: - code - message title: ErrorDetail ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.