Zoho Sign has 1 field that asks for Data, doesn't specify. What data?

I am so confused, I am making a auto-contract generator, and hoping it can auto-send to our clients. But upon trying to configure this field in Zoho Sign, I couldn’t figure any answer to what data to put in here. I’ve tried everything I could think of, there’s not a tooltip on this one so its tricky.

I would appreciate if anyone knows and could share. Make.com is a bit slower with their customer service