What's the best service to manage pre-orders & orders for a digital book?

I'm looking to have pre-order available for a digital book. Then I'd like to move over to an automated fulfillment system (buy -> book shows up in inbox in preferred and/or all formats). Ideally same tool for both. What's good for this?
Ellen ChisaVP Product, Lola · Asked

2 recommended

3
Gumroad

Sell anything directly to anyone.

Ryan Hoover44Founder, Product Hunt · Written
Gumroad (founded by @shl) has been around and used by many indie creators and authors. It should do everything you need!
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2
Celery

Preorder payments (+ ecommerce) with 2 lines of code

Celery has a very straight forward platform.
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