Postman AWS Signature for SP-API not working

Question

I am trying out SP-API catalog items API from postman. Trying to signing request using AWS Signature provided in postman. But getting the following error.

Headers used

Getting the following error

{
"errors": [
    {
        "message": "Credential should be scoped to correct service: 'execute-api'. ",
        "code": "InvalidSignature"
    }
]

}

Answer 1

Try to set "Service name" to "execute-api"

Answer 2

You have entered wrong data in [Service Name]

Set execute-api in Service Name

amz-sp-api postman mayurpathak amazon

Answer 3

Set your your SecretKey = awsSecretAccessKey you recieved when you authorized the app.