Attach copies of any relevant contracts with publishers and financial documents proving payment for the sale. Proof of payment can be accepted in the form of royalty reports, unaltered Amazon KDP reports, or other comparable third-party reports, as well as cashed checks, paypal statements, and/or bank statements with relevant transactions highlighted, etc... (Sensitive personal and account info can be blacked out.).

This form can be submitted multiple times if needed to provide additional documentation.