# Request Flow

When a request is received, the system follows this control flow:

1. **Session Validation**: Check whether the user has an active checkout session.
2. **Basket Check**: Verify whether the basket is empty and whether the products are still available for purchase.
3. **Determine Page**: Determine which page should be shown according to the user's current state.
   * If there are completed steps, redirect to the first incomplete step
   * If all steps are completed, show the final confirmation page
4. **Context Creation**: Prepare and return the data required for the determined page.


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