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Open-Policy Exchange
shopify~5 min to deploy
Shopify Margin Floor Guard
Never discount below margin. Holds the checkout before the payment token is issued when the cart would breach the floor.
For: Ecommerce and finance ops running promotions on Shopify
SOC 2 CC8.1ISO 27001 A.8.34Checkout evidence trail
What it enforces
Margin floor
Blocks a checkout whose net margin falls below the encoded floor, before the token is issued.
Stacked-discount ceiling
Blocks a cart whose combined discount exceeds the authorized ceiling.
Agent price-override restraint
Restrains a price override written by a pricing engine or agent rather than a named merchandiser.
shopify-margin-floor-guard.yaml
# Shopify Margin Floor Guard
# Fork: replace margin_floor_pct with your own cost basis and floor, and run
# in shadow mode until the would-have-blocked list looks right.
apiVersion: decionis.dev/v1
kind: PolicyPack
metadata:
name: shopify-margin-floor-guard
surface: shopify
workflow_key: checkout_margin_guard
standards: [SOC2-CC8.1, ISO27001-A.8.34]
defaults:
mode: shadow
emit_dossier: true
margin_floor_pct: 15
rules:
- name: margin_floor
when: "action == 'checkout.commit'"
decision: |
BLOCK IF order.net_margin_pct < margin_floor_pct
ALLOW OTHERWISE
reason_code: below_margin_floor
- name: stacked_discount_ceiling
when: "action == 'checkout.apply_discount'"
decision: |
BLOCK IF combined_discount_pct >= 50
ESCALATE IF discounts.count > 1
ALLOW OTHERWISE
reason_code: stacked_discount_over_ceiling
- name: agent_price_override_restraint
when: "action == 'price.override'"
decision: |
RESTRAIN IF actor.type in ['automation', 'agent']
ALLOW OTHERWISE
reason_code: price_override_by_non_human
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.Ships in shadow mode — every verdict is recorded, nothing is blocked.
What to do next
This recipe is one step in a path. The same five steps apply to every recipe in the exchange.
- Simulate this recipe
Run the policy against a realistic action in the browser. Push it past what the rules allow and watch the verdict come back. No account.
- View the signed Decision Dossier
See exactly what was decided and why: the rule that fired, the evidence it read, the policy version in force, and an Ed25519 signature you can verify yourself.
- Deploy in shadow mode
Measure what the policy would have caught on your own traffic without touching the live path. Every recipe defaults to shadow, so the first deployment carries no execution risk.
- Connect a real workflow
Point the same policy at the system where the action actually originates — a checkout, an ERP posting, a Zap, an agent's tool call.
- Share the verified result
Publish the proof: a public verification link, an embeddable badge, a PR comment, or an anonymized shadow-mode finding. This is how the next person discovers Decionis.