Amazon SP API Integration ERPNext version 15

I am trying to connect Amazon SP API with ERPNext Version 15
Is there a a documentation of where i can find all the required credentials?

Please check the documentation but no idea if it worked in v15 or not.

Enter the IAM ARN, Refresh Token, Client ID, Client Secret, AWS Access Key, AWS Secret Key and Country.

this is what the documentation says and I have added them but the sync order button makes no change to the Sales Order count nor are my new products syncing

Wanted to get a better understanding about this

Thanks in advance