title: How to generate access token for an AWS Cognito user?
body: <p>I' using Cognito user pool for securing my API gateway . Now I would like to make requests to my API using postman but I need to pass in Authorization token as the API is secured. Is there any AWS CLI command or REST API to generate auth tokens(by passing username/password)?  I have searched documentation but couldn't find any examples. Thanks for your help.</p>