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Open-Policy Exchange
shopify~5 min to deploy
Shopify Oversell Prevention
Blocks fulfilling an order for stock oversold across channels — before the fulfillment token is issued.
For: Multi-channel Shopify merchants with a shared inventory pool
SOC 2 CC8.1ISO 27001 A.8.34Fulfillment evidence trail
What it enforces
Over-selling gate
Blocks an order that would ship more units than the system of record has in stock.
Cross-channel reservation guard
Restrains fulfillment when the same units are reserved on another channel.
Stale inventory feed check
Escalates a fulfillment decided on an inventory feed older than the freshness window.
shopify-oversell-prevention.yaml
# Shopify Oversell Prevention
# Fork: set the feed freshness window your integration can actually hold.
apiVersion: decionis.dev/v1
kind: PolicyPack
metadata:
name: shopify-oversell-prevention
surface: shopify
workflow_key: order_fulfillment
standards: [SOC2-CC8.1, ISO27001-A.8.34]
defaults:
mode: shadow
emit_dossier: true
feed_freshness_minutes: 30
rules:
- name: over_selling_gate
when: "action == 'order.fulfill'"
decision: |
BLOCK IF units_ordered > units_available
ALLOW OTHERWISE
reason_code: oversold_inventory
- name: cross_channel_reservation_guard
when: "action == 'order.fulfill'"
decision: |
RESTRAIN IF inventory.reserved_on_other_channel == true
ALLOW OTHERWISE
reason_code: units_reserved_elsewhere
- name: stale_inventory_feed_check
when: "action == 'order.fulfill'"
decision: |
ESCALATE IF inventory.feed_age_minutes > feed_freshness_minutes
ALLOW OTHERWISE
reason_code: stale_inventory_feed
Fork it, change the thresholds to match your environment, and deploy in shadow mode first — it defaults to listen-only so nothing in your live pipeline changes.
How to install it
The app evaluates checkouts and order admissions in read-only mode by default — no live behavior changes until you enable enforcement.
Shopify — shadow mode
1. Install "Decionis Margin Protection" from the Shopify App Store.
2. Pick a starter pack (margin guard / oversell prevention / refund threshold).
3. App is in read-only mode by default — every governed checkout / order
produces a signed Decision Dossier. No shopper-facing change.Install from the Shopify App StoreShips in shadow mode — every verdict is recorded, nothing is blocked.