Inventory & Quantity Limits

This guide explains how to configure inventory settings and quantity limits for your pre-order campaigns.

Inventory Modes

Inventory mode determines when the pre-order badge and button appear on your storefront.

Allow When Out of Stock

Pre-order is available only when a product variant has 0 or negative inventory.

This is the most common setting for pre-orders. When a product runs out of stock, customers see the pre-order option instead of the “Sold out” button.

Auto-disable when back in stock: Enable this option to automatically pause the pre-order when inventory is replenished. The app listens to Shopify inventory webhooks and updates the offer status accordingly.

Allow When In Stock

Pre-order is available only when a product variant has inventory above 0.

Use this for products that are in stock but you want to accept pre-orders for future batches or made-to-order items.

Always

Pre-order is always available regardless of inventory level.

Use this for products that are always available for pre-order, such as custom or made-to-order items.

Quantity Limits

Quantity limits help you control how many pre-order units are sold. You can set three types of limits:

Campaign Total Limit

Maximum total units sold across all customers for the entire campaign.

When reached, the pre-order badge and button are removed from the storefront
Existing orders are not affected
Useful for limited edition drops or products with constrained supply

Per Customer Limit

Maximum units a single customer can purchase across all their orders. Premium feature (coming soon).

Tracked by customer ID (logged-in customers)
When reached, the customer can no longer add the product as a pre-order
Leave empty for unlimited

Per Order Limit

Maximum units per single order.

Limits the quantity a customer can add to cart in one transaction
Useful for preventing bulk buying and ensuring fair distribution
Leave empty for unlimited

Inventory Reserve Policy

Choose when Shopify reserves inventory for pre-order items:

On Sale (Recommended)

Inventory is reserved when the pre-order is placed.

Reduces available inventory immediately
Prevents overselling
Best for products with limited stock

On Fulfillment

Inventory is reserved when the order is fulfilled.

Available inventory is not affected until you ship
Allows selling beyond current stock
Best for made-to-order or products with reliable supply

Inventory Policy When the Offer Becomes Inactive

Pre-orders work by turning on Shopify’s “Continue selling when out of stock” for products in an offer. When an offer is paused, completed, archived, or deleted, choose what happens to that Shopify setting:

Option	Behavior
Stop selling when out of stock	Turns “Continue selling when out of stock” off — prevents overselling after the campaign ends
Continue selling when out of stock	Keeps it on — customers can still buy past zero stock
Keep current setting	Leaves the Shopify setting unchanged

You also choose this policy when pausing or deleting an offer from the offer list — the confirmation dialog asks each time.

Product-Level Settings

When adding products to an offer, you can configure:

Setting	Description
Per-product quantity limit	Override the campaign-level limit for specific products
Custom delivery message	Show a specific delivery estimate for this product
Can pre-order toggle	Enable or disable pre-order for specific variants

How Inventory Sync Works

The app monitors Shopify inventory webhooks in real-time
When inventory changes, the app checks if the product is in an active offer
Based on the inventory mode:
- Allow when OOS: If inventory goes above 0 and auto-disable is on, the offer pauses for that product
- Allow when in stock: If inventory drops to 0, the pre-order badge is removed
Products in the offer are synced with Shopify Selling Plans