Pusher private-channel authentication using AWS Lambda w/ Gateway API
Author: kvnn // @kevinriggen // email@example.com
Pusher private-channels require authentication [i].
Lambda functions [ii] are a good candidate for doing the computation that determines whether a user is authenticated for a private channel, or not.
An API Gateway resource [iii] is necessary to receive the Pusher client's request & send it to the Lambda function, then send the Lambda function's response back