Hello
I've been working setting up my own payment site for the last few days:
http://www.bitcoinpay.com/. I'm currently looking to stock it with a few denominations of Amazon.co.uk gift vouchers for sale, but I also have a generic payment system which does callbacks. You can have a look at example transaction here:
https://secure.bitcoinpay.com/checkout/?merchant_id=1&merchant_order=24&amount=1.000000If anyone else is interested in using it give us a shout - it automatically:
Generates a BitCoin address for the transaction
Presents the user with a nice page (which can be modified to taste) asking for payment
Gives one click access to payment services such as MyBitCoin and Vekja
Keeps note of payments made to that address
Upon hitting the amount specified sends a callback to the merchant
Allows the user to see how much has been recieved along with number of confirmations
There's an UberCart module in beta right now, and I'm looking to make plugins for OSCommerce and ZenCart.
Update: After 2 confirmations the payment is sent straight to the merchant. You don't need to withdraw as such.