Data Consistency

Data consistency is critical in the checkout flow. The system applies the following principles:

• Cascading Invalidation: When a change is made in a critical step (for example, address change), subsequent steps affected by this change are automatically reset.

• Precondition Checks: Before accessing any step, it is verified whether previous steps have been completed.

• Session-based Storage: Checkout information is stored temporarily until the order is completed and is automatically cleared when the session expires.