issue related to amazon aws api for getcompetitve price

Hello Team,
We are facing issue in calling https://mws-eu.amazonservices.com/Products/2011-10-01 this api. We are getting error of Access Denied
Caught Exception: Access to Products.GetCompetitivePricingForSKU is denied Response Status Code: 401 Error Code: AccessDenied Error Type: Sender Request ID: f0ce3e50-ee80-42ea-9876-04ba4a37d16a XML: Sender AccessDenied Access to Products.GetCompetitivePricingForSKU is denied f0ce3e50-ee80-42ea-9876-04ba4a37d16a ResponseHeaderMetadata: RequestId: f0ce3e50-ee80-42ea-9876-04ba4a37d16a, ResponseContext: mcbMTXQLhoPotTcSTdzYC/XNGVz0pAyTkoIDUjrPqiFcc0tnCaJ5hMYlabRN1Bq69cLpI7SiI2w=, Timestamp: 2019-04-18T10:46:29.886Z, Quota Max: , Quota Remaining: , Quota Resets At:

Can you please let us know, how we can get this resolve? Any information you want from us to understand the issue?

Please do the needful

Thank you