Thoughts and musings.
Google have changed lots of their Android Firebase APIs. This is how I went about getting the correct device token for Firebase messaging with Amazon Pinpoint.
Receiving an OptOut: 'ALL' response when trying to send notifications to an iOS device using Amazon Pinpoint? This is how I went about fixing the issue.
Amazon Web Services' (AWS) Convertible Reserved Instances (CRI) are/were fundamentally broken. This is my experience trying to get them to fix it.