The feature you are asking for is a programming feature not related to the FaaS form processor.
In such a scenario the information from the first page is saved in cookies and then verified in the second page. This is not related to the API. A typical flow is as follows:
- First page collects the information
- First page posts the information to an internal page for review, saving all posted information from page one in cookies
- Upon clicking a final submit button the form fields are submitted to the processor with the field names getting their information from the cookie
As stated this is 100% programming and not related to the API.
Hope that answers the question.
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