how to add new section between choosing product types and charging customers

[VeroniqueSF]

Hi everybody! We need to add a marketing source options (answers for question "How did you know about us?") before cashiers charge guests. Right now it is a special section which cashiers may skip (one of blocks is called "advertising" but cashiers are still able to proceed to payment without pressing these buttons, but we need to make this point mandatory. What we need is smth like a question popping up so they could answer it first choosing the option provided before customers pay. How can we change it?

[kellyj]

@VeroniqueSF

This is definitely a feature request for our Directory team. At this time there is no way to make a required field, but I can see how this would be incredibly useful. 

I'm happy to bubble this up to the Product Team. In the meantime, here is a little information on how our Feature Request process works.