For any author—and publisher—navigating the sea of digital-book retailers is no easy feat. Amazon, iBookstore, and Barnes & Noble are the well-known giants, together accounting for an estimated 95% of the ebook market. But what about those other e-retailers making a splash: Kobo, Samsung, Sony, Google Play, and Baker & Taylor? Below we dive into these emerging markets:
Kobo

As a publisher, the bookstore is actually your customer. And of course you want to give your customer good service.
Customers respond well when they are treated well. They buy more of your product. So it's very much in your interest to treat booksellers the way they want to be treated, even if it means a little extra work and thought; bookstores are the portal to your readers.
Some general rules of thumb: