We applied for the beta testing and it was installed within a few hours and has been working perfectly!
Strongly encourage all to apply for the beta testing program shown above.
Do you have any plans for Amazon Payments Multi Currency support too?
If store Currency and Amazon Payment Currency doesn't match, It gives an error of "Currency Mismatch"
If Store Currency matches with Amazon Payment currency but Customer chooses another currency, the order total is submitted to Amazon Pay in Store Currecy and can confuse the customer.