Inventory and Reservation Conflicts

Cart Reserve does not modify Shopify inventory.

Instead, it operates alongside Shopify’s inventory system to manage temporary availability.

Inventory Source of Truth

• Shopify remains the source of truth for inventory levels
• Cart Reserve reads inventory data from synced products and variants
• Inventory changes in Shopify are reflected in reservation behavior

Concurrent Sessions

When multiple sessions interact with the same product:

• Inventory is reserved on a first-come, first-served basis
• Once inventory is fully reserved, additional reservations are blocked
• Released or expired reservations immediately free inventory

This prevents overselling during high-demand scenarios.

Inventory Changes During Active Reservations

If inventory is adjusted in Shopify while reservations are active:

• Availability is re-evaluated
• Existing reservations may limit further quantity increases
• Checkout validation continues to enforce active reservations