<< As you know, every Kickstarter project has a funding goal and deadline, both of which are determined by the project creator. When that deadline is reached, one of two things happens:
1. If the project has met or exceeded its funding goal, all backers’ credit cards are instantly charged and funds go directly to the project creator.
2. If the project has not met its funding goal, all pledges are immediately canceled. And that’s it.
Amazon Payments is the only processor that currently supports these requirements, and currently Amazon Payments does not support non-US recipients — meaning that you need a US bank account and address to launch a project on Kickstarter. >>
That doesn't say that they pre-authorize the amount. The requirement they're probably referring to is the ability to send funds directly to the project creator.
1. If the project has met or exceeded its funding goal, all backers’ credit cards are instantly charged and funds go directly to the project creator.
2. If the project has not met its funding goal, all pledges are immediately canceled. And that’s it.
Amazon Payments is the only processor that currently supports these requirements, and currently Amazon Payments does not support non-US recipients — meaning that you need a US bank account and address to launch a project on Kickstarter. >>
http://www.kickstarter.com/blog/amazon-payments-and-us-only