What version of Amazon are you supporting? Amazon.com is different from Amazon.uk and Amazon.de. I have an account on Amazon.de and my balance can't be transferred to Amazon.com. It's important that you make it clear which site is supported by your site. Usually people use only one of the Amazon stores. I don't own any USD and I'm not interested in Amazon.com.
We are very young project and at this moment we support Amazon.co.uk and we deliver from UK to the listed 36 countries currently supported (we plan to increase this number)
Still we are working towards the expansion of our services to other countries vendors and we will inform you when Amazon.com or .de is available. Meanwhile you can order items from Amazon.co.uk and we will arrange delivery to your country if its in the currently supported countries list:
https://bitstore.tech/countriesIf you want, you can register on our website to stay up to date with our news and announcements.