Bearer keys, prefixed ULIDs, cursor pagination, idempotency on every mutation, signed webhooks. Learn it once for SK Inventory; it holds across all of Softknack.
Every stock mutation requires an Idempotency-Key, so offline syncs and retries can never double-count. Movements are append-only; the on-hand quantity is derived from the log.
Get a test key, make one authenticated call, and listen for the webhook. The same three moves work for every endpoint in the suite.
Test and live keys are separate environments. Build against sk_test_ without touching a real customer.
One authenticated POST with an idempotency key. Same key + same body always returns the same result.
A signed movement.created event hits your endpoint — verify the HMAC, act on it, return 200.
curl -X POST https://api.softknack.com/inventory/v1/movements \ -H "Authorization: Bearer sk_live_..." \ -H "Idempotency-Key: 9f2c-4d1a-...-e7b3" \ -H "Content-Type: application/json" \ -d '{ "item_id": "itm_01J9X...", "qty": -2, "type": "sale", "reason": "order_fulfilled" }'
Signed with HMAC-SHA256, delivered at-least-once, retried on a fixed schedule, and replayable from a dead-letter queue. You will never miss an event because a deploy was mid-flight.
| Event | When it fires |
|---|---|
movement.recorded | Receipt, sale, return or adjustment — idempotent, reason-coded. |
grn.completed | Purchase receipt posted: quantities, lots, landed cost. |
stock.low | Reorder threshold crossed. |
stock.out | On-hand reached zero. |
dayend.closed | Variances booked forward as current-dated adjustments. |
lot.expiring | A batch is approaching expiry. |
The platform conventions every SK product obeys — learn them once, rely on them everywhere.
Every mutation takes an Idempotency-Key. Same key + body returns the original result; a conflicting body gets 409.
Sortable, debuggable IDs like mov_01J9X... — you can read the type and the time right off the wire.
Stable cursors that never skip or repeat a row when data changes mid-list. No page-offset drift.
Isolation enforced in the database. 404-over-403, so the existence of another tenant's record never leaks.
HMAC-SHA256 on every delivery, with the full retry schedule and dead-letter replay above.
The OpenAPI spec is generated from the code's validators and checked in CI — the docs can't lie.
Sync stock from a POS, a warehouse scanner, or a marketplace over REST — every mutation idempotent, so a flaky network never double-counts. Subscribe to stock.low to drive reordering, or expose inventory to your own agents over MCP so they can answer 'in stock?' truthfully.
Query on-hand quantity and WAC for any item over the API in one call — the same read the chat and voice agents use to answer availability questions live.
Auth, errors, pagination, every endpoint and schema — written once for the platform, shared by every product.
docs.softknack.com/inventory See pricing →