AWS Pinpoint REST API calls - URGENT

I need assistance getting AWS Pinpoint Events/Analytics to log: [login to view URL] This is for a non-native app (using Unity), so only the REST API can be used (there are SDKs for JS, Android and iOS, but these need to be avoided). Amazon Cognito identity pool with enabled access to unauthenticated identities is to be used, as per the docs. Pinpoint Events are simply going to be Analytics, such as button clicks within the app. No other features of Pinpoint are required. I'd like to have full instructions on configuring anything on AWS, and a working example which I can try out in something like Postman. Some support my be required with testing it with my account, although it may be easier to use your AWS account get get it working initially.