Processing Flow

When the form is submitted the system performs the following steps:

1. Determine Page: Identify which page the submitted data belongs to.

2. Precondition Check: Verify the page's preconditions. If preconditions are not met, the user is redirected to the appropriate page.

3. Data Validation: Validate the submitted data according to the page rules.

   • In case of invalid data, return error messages

   • If data is valid, update the checkout state

4. Apply Campaigns: After data validation, recalculate applicable campaigns and discounts.

5. Determine Next Page: After a successful operation, the response includes the next page information within the page context, indicating which step the user should proceed to.