ecommerce

To ensure checkout totals match, enforce server-side total authority so the backend calculates the final cart totals independently of client-side displays. This prevents SPA-to-API synchronization mismatches where customers see one total but order records show another.

Coupon code discounts and commissions stay consistent by applying backend-only discount calculations and preserving payout logic throughout the checkout progression. This ensures commission calculations remain accurate even after promo codes modify the final cart total.

Handle Cash on Delivery and PayPal selection safely by maintaining a strict separation between payment_method and payment_status fields during checkout state transitions. This ensures the order accurately records the selected payment method while tracking its fulfillment status independently.

Prevent cross-store or cross-customer data exposure by implementing secure API and panel scoping that enforces the single-store constraint. This ensures cart mutations, order history, and order details remain strictly isolated to the authenticated customer and their specific store context.

The best way to audit cart mutation and checkout progression is to validate backend totals, authorization checks, and payment state handling from cart addition through order placement. This end-to-end verification catches discrepancies in product variants, addresses, and shipping selections.

Separate product reviews from store reviews when your marketplace policy requires distinct feedback collection for the item purchased versus the seller's service. Clarify the review type before changing UI components to ensure the review data correctly maps to the target entity.