> ## Documentation Index > Fetch the complete documentation index at: https://api-docs.useopenwrench.com/llms.txt > Use this file to discover all available pages before exploring further. # Count purchase request line items > Returns the number of purchase request line items matching the supplied filters, scoped to the API key's supplier company/facility. Any query-string parameter other than the paging parameters is passed to the data layer as an equality filter on the corresponding entity column (e.g. `status=requested`, `stockLocationId=42`). Results are always restricted to the supplier company/facility associated with the API key. ## OpenAPI ````yaml /openapi/partners.json get /v1/partners/inventory/purchase_request_line_items/count_by openapi: 3.1.0 info: title: OpenWrench Internal Teams API version: 1.0.0 description: >- External partners API for OpenWrench supplier inventory: purchase requests, purchase orders, receipts, parts, equipment types, vendors, stock locations, per-stock-location inventory, and work order part/equipment usage. ## Authentication Every request must include an API key in the `X-API-KEY` header. Requests with a missing or invalid key receive `401 Unauthorized`. All data is scoped to the supplier company/facility of the contact the API key belongs to. ## Rate limiting Each API key is limited to 10 requests per 20-second window. Requests beyond that receive `429 Too Many Requests`. ## Response envelope Single-entity responses are wrapped as `{ "type": "", "data": { ... }, "status": "ok" }`. List responses are wrapped as `{ "type": "", "data": [ ... ], "count": , "status": "ok" }` where `count` is the total number of matching records. Count endpoints return `{ "type": "Count", "data": , "status": "ok" }`. Errors are returned as `{ "message": "...", "type": "", "status": "error", "traceId": "..." }` with HTTP status 400 (bad input), 401 (missing/invalid key), 404 (not found), or 429 (rate limited). ## Pagination and filtering List endpoints accept `offset`, `limit` (default 10, max 25), `sort_by`, and `order` (`asc`|`desc`) query parameters. Any other query parameter is passed through as an equality filter on the corresponding entity column. ## Date formats Date-time fields serialize as strings in one of two shapes depending on the underlying type: ISO 8601 with offset (e.g. `2026-08-14T13:05:22.000-07:00`) for most timestamps, or `yyyy-MM-dd HH:mm:ss.S` (space-separated, no offset) for database timestamp fields. Plain dates are `yyyy-MM-dd`. When sending date-times, ISO 8601 is accepted. ## API keys These endpoints require a **partner API key**, which is separate from buyer and supplier API keys. A buyer API key will not authenticate against `/v1/partners/` endpoints. Contact support@useopenwrench.com to have a partner key issued. ## Required headers Every request must carry BOTH `X-API-KEY` (your API key) and `OW-KEY` (the OpenWrench shared secret issued with it). Requests missing either return 401. servers: - url: https://api.useopenwrench.com/api/external security: - ApiKeyAuth: [] OwKeyAuth: [] tags: - name: Ping description: Health/authentication check - name: Purchase Requests description: Supplier inventory purchase requests - name: Purchase Request Line Items description: Line items on purchase requests - name: Purchase Orders description: Supplier inventory purchase orders - name: Purchase Order Line Items description: Line items on purchase orders - name: Purchase Order Receipts description: Receipts recorded against purchase order line items - name: Parts description: Supplier part catalog - name: Equipment Types description: Supplier equipment type catalog - name: Vendors description: Part/equipment vendors - name: Stock Locations description: Warehouses and mobile stock locations - name: Parts Per Stock Location description: Part stocking records per stock location - name: Equipment Per Stock Location description: Individual equipment held per stock location - name: Work Order Parts and Equipment description: Parts and equipment used on work orders paths: /v1/partners/inventory/purchase_request_line_items/count_by: get: tags: - Purchase Request Line Items summary: Count purchase request line items description: >- Returns the number of purchase request line items matching the supplied filters, scoped to the API key's supplier company/facility. Any query-string parameter other than the paging parameters is passed to the data layer as an equality filter on the corresponding entity column (e.g. `status=requested`, `stockLocationId=42`). Results are always restricted to the supplier company/facility associated with the API key. operationId: countPurchaseRequestLineItems parameters: - $ref: '#/components/parameters/Offset' - $ref: '#/components/parameters/Limit' - $ref: '#/components/parameters/SortBy' - $ref: '#/components/parameters/Order' responses: '200': description: Successful response content: application/json: schema: $ref: '#/components/schemas/CountResponse' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' components: parameters: Offset: name: offset in: query required: false schema: type: integer minimum: 0 default: 0 description: Number of records to skip Limit: name: limit in: query required: false schema: type: integer minimum: 1 maximum: 25 default: 10 description: Page size (default 10, max 25) SortBy: name: sort_by in: query required: false schema: type: string description: Field name to sort by Order: name: order in: query required: false schema: type: string enum: - asc - desc description: Sort direction schemas: CountResponse: type: object description: Envelope whose data is an integer count. properties: type: type: string description: '"Count"' data: type: integer format: int64 description: The count status: type: string enum: - ok required: - type - data - status Error: type: object description: Standard error envelope. properties: message: type: string description: Human-readable error message type: type: string description: >- Exception type, e.g. badRequestException, unauthorizedException, notFoundException status: type: string enum: - error traceId: type: string description: >- Server-generated trace identifier (11 alphanumeric characters) for support/debugging required: - message - type - status - traceId responses: Unauthorized: description: Missing or invalid X-API-KEY content: application/json: schema: $ref: '#/components/schemas/Error' TooManyRequests: description: Rate limit exceeded (10 requests per 20-second window per key) content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-KEY description: >- Supplier partner API key. Rate limited to 10 requests per 20-second window. OwKeyAuth: type: apiKey in: header name: OW-KEY description: >- OpenWrench shared secret. Required on every request alongside X-API-KEY; issued together with your API key. ````