You don't issue a 1099. You need to read the 1099-K regulations so that you can support your clients for whom you are guiding them and preparing their income taxes:

https://help.venmo.com/hc/en-us/articles/4410097047315-What-to-Expect-for-Tax-Season

Hi there,

You’ve come to an Intuit site supporting tax professionals, and you may be looking for support as an individual taxpayer. Please visit the TurboTax Help site for support.

Cheers!

OR maybe

Hi there,

You’ve come to an Intuit site supporting Lacerte, ProSeries, or ProConnect Tax Online products. Please visit the QuickBooks Help site for the answer to your question.

Cheers!