Is your feature request related to a problem? Please describe.
SNS endpoint subscriptions must expose a public facing HTTP server ( unless I missed something ) and therefore make it possible for untrusted sources to post messages to the event bus as long as the message comply with basic message format.

Describe the solution you'd like
The SNS source should verify the signature of the

Am just going through the docs with fresh eyes and have a few questions/directions to put on the table just to see what the reception might be. Background wise, I have written proprietary solutions to serve as "uart drivers" to be executed via Avocado/pytest.

I will assume the following goal proposition:

The goal proposition of the getting started document is to attract new contributors