Ask HN: What do you use to take preorders when validating a product?

Paypal, Shopify etc only allow you to take orders to be fulfilled within a week. Stripe will let you authorise payments for preorders as far in advance as you like, but there's a bigger overhead - storing user data, creating a UI to view / process payments at a later date / deal with refunds. Does anyone use anything better? Are there any simple services for taking preorders for products you won't be shipping for 6+ months?