How can I have my client pay for using a Clerky product?

By default, the person who starts a document set will be responsible for its invoice. If your client starts the document set, they’ll pay for the product by default. 

If someone at your law firm starts the document set, they can re-assign the invoice to someone else. See How do I re-assign the invoice for a document set to someone else? for step-by-step instructions.