I am using amazon api for getting details of a product whether it exists or not. I have created Access Key ID, Secret Access Key & Associate ID. I called this to get the details
http://webservices.amazon.com/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=**KEY**&AssociateTag=**TAG**&Operation=ItemSearch&Keywords=the%20hunger%20games&SearchIndex=Books&Timestamp=2016-10-07T12:18:26Z&Signature=Signature
but I am getting
"The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details"
What should I do to get rid of this issue.? How to get signature? Also I would like to know whether I could post a product with amazon api ?
http://docs.aws.amazon.com/AWSECommerceService/latest/DG/ItemSearch.html