Well, HiveList is basically setting up easy storefronts for people, but the backend payment is handled by https://hivepay.io/ which you could integrate yourself on your existing websites too if you wanted. At least for the digital copies I'm pretty sure HiveList would be pretty simple and fully automated for you.

@jrej might be good to ask any experiences and feedback so far. I’ve been meaning to test out the ordering side of the process on his graphic novel.

https://hivelist.store/product/shades-of-men-paperback-digital/