Correct answer - "Cognito User Pools" : After successfully authenticating a user, Amazon Cognito
issues JSON web tokens (JWT) that you can use to secure and authorize access to your own APIs,
or exchange for AWS credentials.
Incorrect:
"API Gateway" - If you are processing tokens server-side and using other programming languages
not supported in AWS it may be a good choice other than that go with a service already providing
the functionality
"Cognito Identity Pools" - A way to authorize your users to use the various AWS services vs
authorization in your application
"Cognito Sync" - You can use it to synchronize user profile data across mobile devices and the
web without requiring your own backend