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Getting Started

Cart Reserve helps prevent inventory conflicts by reserving product quantities during the shopping session, before checkout is reached.

This page provides a high-level overview of how Cart Reserve fits into the Shopify flow and what to expect when setting it up.

High-Level Overview

By default, Shopify validates inventory availability at checkout. In high-traffic stores or when inventory is limited, this can lead to multiple customers competing for the same stock.

Cart Reserve introduces a temporary, session-based reservation layer that operates while customers interact with the cart. This allows inventory conflicts to be handled earlier and more predictably.

Reservations are created per session and automatically released when they expire or become invalid.

Where Cart Reserve Acts in the Shopify Flow

Cart Reserve integrates into Shopify’s standard storefront and checkout flow without replacing native behavior.

At a high level, the flow looks like this:

Product page
 → Add to cart
 → Cart updates
 → Reservation created or updated
 → Checkout
 → Checkout validation
  • Reservations are created when products are added to the cart or quantities are updated
  • Reserved quantities are validated during checkout
  • Inventory is released when checkout is completed, a reservation expires, or the session ends

This approach shifts inventory contention from checkout time to cart interaction time.

What You Need Before Installing

Before installing Cart Reserve, ensure the following requirements are met:

  • A Shopify store with the Online Store sales channel enabled
  • A published theme
  • Access to Shopify Admin settings
  • Checkout rules enabled in your Shopify plan (available on all current Shopify plans)

No code changes are required for standard Shopify themes.

What Will Be Enabled After Installation

Installing Cart Reserve does not immediately change storefront behavior. Several components must be enabled to activate reservation logic.

After installation, the following will be active:

  • A Cart Reserve app embed in your theme that connects the app to cart and product elements
  • A checkout validation rule that enforces reserved quantities during checkout
  • A background product synchronization process that imports products and variants

Each of these components is required for Cart Reserve to function correctly.

Installation at a Glance

The installation process consists of the following steps and should be completed in order:

  1. Install Cart Reserve from the Shopify App Store
  2. Enable checkout validation in Shopify settings
  3. Enable the Cart Reserve app embed in your active theme
  4. Sync products from your store

For step-by-step instructions, see Installation.

What Happens After Installation

Once installation is complete and products are synced, Cart Reserve becomes active on the storefront.

You should observe the following behavior:

  • Reservation timers or indicators appear on product or cart pages
  • Active reservation sessions become visible in the admin dashboard
  • Checkout blocks quantities that exceed active reservations

If any of these elements are missing, review the Installation checklist or the Storefront Integration section.

Next Steps

Continue with one of the following sections:

  • Installation — to enable and verify Cart Reserve
  • Core Concepts — to understand reservation logic in detail
  • Storefront Integration — if you use a custom or modified theme