How MOQ Manager Works
Enforce minimum order quantities, maximums, and order multiples at Shopify checkout — natively, with Shopify Functions. Try the interactive rule tester.
What is MOQ Manager?#
MOQ Manager enforces quantity rules — minimums, maximums, and order multiples — on your Shopify store. Rules are checked by a Shopify Function running inside checkout itself, so they can't be bypassed by theme quirks, direct cart links, or clever customers. It's built for wholesale, print, and any business where a 1-unit order loses money.
Try a rule right now#
Configure a rule, break it, fix it — this is exactly how enforcement behaves at checkout, error messages included.
Test a quantity rule
Product page badge preview
Minimum order: 6 units · Maximum order: 24 units
Your cart
Counted toward the rule: 4
⚠ Minimum order quantity for "Ceramic Mug" is 6. You have 4.
Enforced by a Shopify Function inside checkout — no storefront workarounds.
The three constraint types#
| Constraint | What it enforces | Typical use |
|---|---|---|
| Minimum quantity | At least N units | Wholesale minimums, print run floors |
| Maximum quantity | At most N units | Limited editions, stock protection |
| Order multiples (step) | Exact multiples of N | Packs, pairs, cases — no partial packs |
Use one, two, or all three on the same rule — details in Quantity Constraints.
The three rule scopes#
- Product rules — the minimum applies to all variants of a product combined
- Variant rules — only one specific variant counts
- Collection rules — cover a whole collection in one rule
How they combine and aggregate is covered in Rule Types.
Why enforcement at checkout matters#
Most quantity apps only nudge — a widget on the product page that a customer can scroll past, or JavaScript that breaks with the next theme update. MOQ Manager registers a Cart Validation Function with Shopify: every checkout, from any entry point, is validated inside Shopify's own infrastructure. If the cart violates a rule, checkout is blocked with a clear message (which you can customise).
The optional storefront widget adds friendly early warnings on product and cart pages — but checkout enforcement is always the authoritative check, widget or not.
Where to next?#
- Getting Started — install, activate, first rule in five minutes
- Checkout Enforcement & Messages — customise the error copy
- Plans & Billing — free for rules covering up to 3 products; paid plans from $5/month with 14-day trials
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