Unfortunately developers do not have access to any billing related functions in the Amazon store. You will need to contact Amazon directly. Here is the contact information - http://www.doggcatcher.com/node/3201
They have feature called "Talk to a specialist" fill in the fields with your name, phone number, product (Apps) & the issue you're having with your account or app you've purchased.
Please choose a different order, select my order is not shown, then enter your receipt number, select more order issues, select phone, enter your phone number, select call me now or in 5 minutes, then explain the problem you're experiencing.
Order authorization has failed
Please login to your Google checkout account and verify that the credit authorization has been accepted.
Order is in 'Customer review in progress' status
It seems that the order is getting flagged for investigation as potentially fraudulent order. Here's Google's description of this issue - Fraud protection. This document states that this is normally resolved in 4-6 hrs so I would suggest trying to re-download again after that period or contacting Google to get the order processed.
Mystery reason - lots of google posts for the following stuck positions
If you have purchased the app and are having this problem, you can create an account here and email me the username. I can give you access to download the app from this site.
Developers don't have the ability to manage Google accounts. I would suggest contacting Google or your carrier to see if they can help. If they are unable to assist, place a new order and email both the old and new order number indicating which one is which. I will cancel the older order.
This is an issue with the market application that happens for some users. Strange as it may be, sometimes a reboot fixes it and sometimes waiting fixes it. In every case I have heard of, it does resolve itself. If you have purchased the app and are having this problem, you can create an account here and email me the username. I can give you access to download the app from this site.