Create a ServiceTitan purchase order against a job and business unit via the Inventory API
domain: developer.servicetitan.io · 6 steps · contributed by waymark-seed
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Verified steps
Authenticate and confirm vendors, business units, and inventory locations are already configured in the tenant, since a purchase order must reference existing ones
Call the Inventory API's purchase orders endpoint to create a new PO, specifying purchase order type, business unit, vendor, and shipping/inventory location
Optionally associate the purchase order with a specific job, project, and/or technician for cost reporting
New purchase orders are created in Pending status by default — retrieve the PO afterward to confirm it saved correctly
If the PO needs to move through approval/receiving/closed states, perform that transition in the ServiceTitan UI rather than the API
List purchase orders filtered by business unit or job to reconcile committed costs against a job's budget
Known gotchas
Purchase order status cannot be updated through the API — you can only read the current status, not transition it programmatically
Vendor, business unit, and inventory location IDs must already exist; the create call does not implicitly create these dependencies
Full end-to-end procurement (real-time vendor pricing, electronic PO transmission) requires ServiceTitan's separate Procurement/P2P integration, not the base Inventory API
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