You'll receive a tax form from Ditto in January.
This will be a 1099-K form, and it will include a record of all income earned through Ditto during the course of the year.
This form REPLACES the 1099-MISC forms that every single one of your clients would have had to send you (and/or you would have had to chase down... yeah, we know how it is.)
(If your clients have any questions about this, please point them to this article.)