> ## Documentation Index > Fetch the complete documentation index at: https://docs.chatsailer.com/llms.txt > Use this file to discover all available pages before exploring further. # List lost reasons > The reasons this workspace records for losing a deal, by name. To apply one, send `status: lost` and `lost_reason_id` on `PATCH /v1/deals/{deal_id}`. ## OpenAPI ````yaml /api-reference/openapi.json get /v1/lost-reasons openapi: 3.1.0 info: description: >- The Sailer REST API for CRM, conversations, and campaigns. **Authentication.** Send a token as `Authorization: Bearer `. A workspace token (`sk_live_...`) is created by a workspace administrator and its secret is shown once. An OAuth access token (`oat_live_...`) acts on behalf of the person who authorized it and sees only what they can see. Either way the workspace is implied by the token, so no tenant header is needed. Each token carries scopes; `GET /v1/me` lists them. **Pagination.** Collections return `{data, meta, links}`. Pass `links.next` back as `cursor` until it is `null`. Cursors are opaque and only valid for the query that produced them. **Errors.** Every non-2xx response is `{"error": {...}}` with a coarse `type`, a stable `code` and the offending `param`. Quote `error.request_id` (also the `X-Request-ID` header) when contacting support. **Retries.** Send an `Idempotency-Key` header on any write to make retrying it safe for 24 hours. **Rate limits.** Limits are per token. Every response carries `X-RateLimit-Limit`, `X-RateLimit-Remaining` and `X-RateLimit-Reset`; a `429` also carries `Retry-After`. **Custom fields.** Workspace-defined fields appear under `custom_fields`, keyed by field key. `GET /v1/fields` lists every field on a resource, built-in and custom. title: Sailer API version: 1.0.0 servers: - url: https://api.chatsailer.com security: - SailerApiToken: [] tags: - description: Token introspection and workspace capabilities. name: Meta - description: >- People you talk to. Called *leads* in older Sailer surfaces; `contact` is the current name. name: Contacts - description: Companies that contacts belong to (B2B accounts). name: Organizations - description: Opportunities moving through a pipeline. name: Deals - description: Pipelines and their stages. name: Pipelines - description: Field definitions, including custom fields. name: Fields - description: Free-text annotations on CRM records. name: Notes - description: Scheduled and logged CRM activities. name: Activities - description: Per-entity label catalogs. name: Tags - description: Members of the workspace, for assigning records. name: Users - description: Message threads with contacts, across every channel. name: Conversations - description: Outbound campaigns and their participants. name: Campaigns - description: Named contact lists campaigns draw from. name: Audiences - description: The connections you talk to contacts through. name: Channels - description: Pre-approved WhatsApp message templates. name: Templates - description: >- Keeping another system in step with a workspace: the deletion feed. Changes are read from each resource's list with `updated_since`. name: Sync - description: >- Business outcomes your systems report — a sale closed, a meeting held — that your agreement may charge a success fee on. Append-only: a refund is a reversal, never an edit. Needs the `success_events:read` / `success_events:write` scopes. name: Success Events paths: /v1/lost-reasons: get: tags: - Deals summary: List lost reasons description: >- The reasons this workspace records for losing a deal, by name. To apply one, send `status: lost` and `lost_reason_id` on `PATCH /v1/deals/{deal_id}`. operationId: list_lost_reasons parameters: - description: Items per page (max 200). in: query name: limit required: false schema: default: 50 description: Items per page (max 200). maximum: 200 minimum: 1 title: Limit type: integer - description: Opaque cursor from a previous response's `links.next`. in: query name: cursor required: false schema: anyOf: - type: string - type: 'null' description: Opaque cursor from a previous response's `links.next`. title: Cursor responses: '200': content: application/json: schema: $ref: '#/components/schemas/LostReasonList' description: Successful Response headers: X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' X-Request-ID: $ref: '#/components/headers/X-Request-ID' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '429': $ref: '#/components/responses/RateLimited' '500': $ref: '#/components/responses/InternalError' security: - SailerApiToken: [] components: schemas: LostReasonList: description: A page of lost reasons. properties: data: items: $ref: '#/components/schemas/LostReason' title: Data type: array links: $ref: '#/components/schemas/PageLinks' meta: $ref: '#/components/schemas/PageMeta' required: - data - meta - links title: LostReasonList type: object LostReason: description: Why a deal was lost, from the workspace's own list. properties: created_at: format: date-time title: Created At type: string description: anyOf: - type: string - type: 'null' title: Description id: description: Unique identifier for a lost reason. examples: - lrsn_9f2ac41d8b7e4a51b0d3e6f7a1c2d3e4 pattern: ^lrsn_[0-9a-f]{32}$ title: Id type: string name: title: Name type: string object: const: lost_reason default: lost_reason title: Object type: string updated_at: format: date-time title: Updated At type: string required: - id - name - created_at - updated_at title: LostReason type: object PageLinks: properties: next: anyOf: - type: string - type: 'null' description: Opaque cursor for the following page; null on the last page. title: Next title: PageLinks type: object PageMeta: properties: has_more: description: True when a next page exists. title: Has More type: boolean limit: description: Maximum items requested for this page. title: Limit type: integer required: - limit - has_more title: PageMeta type: object ApiErrorResponse: description: Every non-2xx response on the public API has this body. properties: error: $ref: '#/components/schemas/ApiError' required: - error title: ApiErrorResponse type: object ApiError: properties: code: description: Stable, machine-readable identifier. title: Code type: string detail: anyOf: - items: $ref: '#/components/schemas/ErrorDetail' type: array - type: 'null' default: null description: Per-field errors for validation failures. title: Detail documentation_url: anyOf: - type: string - type: 'null' default: null title: Documentation Url message: description: Human-readable explanation. title: Message type: string param: anyOf: - type: string - type: 'null' default: null description: Request field the error refers to, if any. title: Param request_id: anyOf: - type: string - type: 'null' default: null description: >- Echoes the X-Request-ID response header. Quote it in support requests. title: Request Id type: $ref: '#/components/schemas/ErrorType' required: - type - code - message title: ApiError type: object ErrorDetail: properties: code: anyOf: - type: string - type: 'null' default: null title: Code field: description: Dotted path to the offending field. title: Field type: string message: title: Message type: string required: - field - message title: ErrorDetail type: object ErrorType: description: Coarse class of failure. Stable; new codes may appear under a type. enum: - invalid_request_error - authentication_error - permission_error - not_found_error - conflict_error - rate_limit_error - api_error title: ErrorType type: string headers: X-RateLimit-Limit: description: Requests allowed in the current window on this token. schema: type: integer X-RateLimit-Remaining: description: Requests left in the current window. schema: type: integer X-RateLimit-Reset: description: Seconds until the window resets and the allowance refills. schema: type: integer X-Request-ID: description: Unique id for this request. Quote it to support. schema: type: string Retry-After: description: Seconds to wait before retrying. schema: type: integer responses: BadRequest: content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' description: A query parameter, path segment or header is invalid. headers: X-Request-ID: $ref: '#/components/headers/X-Request-ID' Unauthorized: content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' description: The token is missing, unknown, revoked or expired. headers: X-Request-ID: $ref: '#/components/headers/X-Request-ID' Forbidden: content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' description: >- The token lacks a required scope, or the workspace's CRM write policy does not allow this change. headers: X-Request-ID: $ref: '#/components/headers/X-Request-ID' RateLimited: content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' description: Too many requests on this token. Retry after the delay. headers: Retry-After: $ref: '#/components/headers/Retry-After' X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' X-Request-ID: $ref: '#/components/headers/X-Request-ID' InternalError: content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' description: Something went wrong on our side. Quote `error.request_id` to support. headers: X-Request-ID: $ref: '#/components/headers/X-Request-ID' securitySchemes: SailerApiToken: description: >- A workspace API token (`sk_live_...`) or an OAuth access token (`oat_live_...`). Create workspace tokens in Settings > API. Send either as `Authorization: Bearer `. scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.