SNS subscription
As part of the CloudFormation stack you just created, you will receive a email like this in the address you entered during the template deployment:
You should click on the Confirm Subscription in order to be able to receive the notifications that the State Machine will send as part of the automated response. Once you confirm the subscription you should see the following message on the opened webpage:
It might take a few minutes for the email to be delivered. Also check the SPAM folder just in case.
If you done with that, the next step which we will Test the Step Functions.