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Around the purchasing flow sits the reference and stock data: what you can order (parts, equipment types), who you order from (vendors), where it lives (stock locations and per-location inventory), and where it went (work order consumption). All of it is read-only through the Internal Teams API. All examples assume:
Every list below supports the paging parameters plus equality filters on entity columns (any other query parameter, e.g. stockLocationId=42), always scoped to your company.

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Catalog

Sync these into your purchasing system first; every other call references their ids.

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Stock locations and inventory

Stock locations are the warehouses, trucks, and storerooms that hold inventory:
Two record types express what is held where: Parts per stock location (GET /v1/partners/inventory/parts_per_stock_locations, +/{id}) is one record per part per location: on-hand, reserved, and available quantities, bin location, and costs.
Equipment per stock location (GET /v1/partners/inventory/equipment_per_stock_locations, +/{id}) is one record per physical serialized unit: serial number, condition, and provenance. These are the units that receipts with serial numbers create. Receipts are the write path into stock through this API; the read side here is how you reconcile OpenWrench stock against your ERP.

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Parts and equipment used on work orders

GET /v1/partners/work_order/work_order_parts_equipments/{workOrderId} lists the part and equipment records consumed on a work order: the consumption side of the inventory ledger.
Results are paginated and accept the same equality filters. For partner keys whose supplier company is not an internal-technician company, the embedded workOrder and location objects come back masked, with sensitive fields removed.

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Reconciliation pattern

A nightly inventory reconciliation:
  1. Pull parts_per_stock_locations per stock location and diff quantities against your ERP.
  2. Explain the deltas: receipts recorded that day (purchasing inflow) minus work_order_parts_equipments for work orders completed that day (consumption outflow).
  3. Investigate what remains: usually a missed receipt, an unrecorded return (negative receipt), or consumption logged against the wrong work order.