Subscribe to proactive events request the CustomProactiveSubscriptionChangedRequestHandler.java

ProactiveSubscriptionChanged.json

{
    "request": {
        "timestamp": "2019-06-10T12:00:15Z",
        "requestId": "ef896d90-bff1-494b-bda5-aa49952e9687",
        "body": {
            "subscriptions": [
                {
                    "eventName": "AMAZON.OrderStatus.Updated"
                },
                {
                    "eventName": "AMAZON.MediaContent.Available"
                }
            ]
        },
        "type": "AlexaSkillEvent.ProactiveSubscriptionChanged"
    },
    "version": "1.0",
    "context": {
        "System": {
            "apiEndpoint": "https://api.amazonalexa.com",
            "user": {
                "userId": "amzn1.ask.account.AFJ..."
            },
            "application": {
                "applicationId": "amzn1.ask.skill.e2a..."
            }
        }
    }
}