What I'm asking is for documentation that authors get a commission on a one-time lend between Kindle users (the type of lend facilitated by LendInk). I have learned that KDP Select authors get a commission per lend but that may be limited to lends from Amazon to Amazon Prime members.
> Will I receive royalties when customers choose to lend my book?
>
> Loans of digital books through the Kindle Book Lending program
> are not purchases and thus are not eligible to receive royalty payments.
Edit: Specifically, it sounds like LendInk facilitated "Lending for Kindle" loans https://kdp.amazon.com/self-publishing/help?topicId=A2JGI9S4...