I believe Amazon's payment service lets you ice a payment (i.e. put a hold on the money) which can then be released/paid on a further signal (I think it's what

I believe Amazon's payment service lets you ice a payment (i.e. put a hold on the money) which can then be released/paid on a further signal (I think it's what Kickstarter uses). However you should realize that any payment made with a credit card can be reversed, and there's no-way around that.