Make sure you whitelist your route in VerifyCsrfToken.php:
Create an AWS Account & create an SNS Topic
You will need an AWS account and register an SNS Topic and set up a subscription for HTTP(s) protocol that will point out the route you just registered.
If you have registered the route and created an SNS Topic, you should register the URL and click the confirmation button from the AWS Dashboard. In a short while, if you implemented the route well, you'll be seeing that your endpoint is registered.