No results from Amazon JP when querying any search terms

[kanazee]

Hello,

On Oct 1 2017, I found out there are no results from the Amazon JP (amazon.co.jp) although I submit any search terms.
This worked fine until the middle of September 2017 (as far as I remembered).
The following terms are not available : ISBN-10, ISBN-13, Author, Title.
But I could get the results from Amazon US by querying these terms.
Registering AWS ID and keys is fine.
Would you tell me any solutions?

[Conor]

Amazon now requires an associate account for each country. We have to update our interface to allow that, but in the mean time please use our keys that have an associate account at each country.

[kanazee]

Hi, I tried Bookpedia beta with enabled Amazon-test option, it works well when searching Amazon JP with the terms I want to use. I look forward to your update. Thank you for your help.