Prevent Concurrency Conflicts

Checkout orchestrates multiple background operations (called calculators) on your cart. These operations modify the Cart data model—a set of related objects including WebCart, CartCheckoutSession, CartItem, and CartDeliveryGroup.

Understand concurrency to avoid errors. When multiple processes modify the Cart data model simultaneously, the result can be data inconsistencies or failed transactions.

The Cart data model uses optimistic concurrency control. Each cart has a version number that increments with every update. When an operation saves changes, the system compares the current version with the version at retrieval time. If they don’t match, the operation fails—preventing stale data from overwriting recent updates.

See B2B Commerce Checkout Calculators for how calculators work and Cart Data Model for complete entity details.

Get Started with B2B Commerce
B2B Commerce Data Model
B2B Data Deployment
Implementation Lifecycle: Personas
B2B Commerce APIs
B2B Commerce Headless Storefront Implementation Overview
B2B Commerce Extensions
Integrations
Set Up Payment Processing
Cart and Checkout Features
Set Up Guest Checkout for Headless Commerce Stores
Place an Order on Behalf of a User in a B2B Store
Handle Currency Changes
Simplify Cart Cleanup
Streamline Place Order
B2B Commerce Checkout Process with Commerce APIs
How Standard B2B Commerce Checkout Works
Implement B2B Commerce Checkout Flow
B2B Commerce Checkout Calculators
Prevent Concurrency Conflicts
Handle Asynchronous Processing
Avoid Common Misconfigurations
Troubleshooting Checkout Issues
Understanding B2B Checkout Place Order APIs
Commerce SFDX Environment Setup
Build Custom Components
Implement Custom Self-Registration for a B2B Store
Headless Guest Support for Cart and Checkout APIs Using JWT
Commerce LWR Storefront Performance Best Practices
Image Optimization Best Practices
Custom Rules for Product Readiness