How can I get Authentication Key for Rakuten?

I am developing a web application for Rakuten.com . I found their documentation in https://developers.rakuten.com/ but for using Rakuten RMS API I need an authentication key.

Is there an another way for using this API without authentication key (like a demo api)?

Thanks.

Solution

If you are looking for Rakuten.com in the US then you can email us at [email protected]. We will be able to answer any questions from merchants and developers.

If you this request is for any other country then you will need to proceed with the advice Stelian has provided.