Añadiendo soporte para notificaciones en una skill Alexa

skill.json

{
  "manifest": {
    "apis": {
      // ...
    },
    "manifestVersion": "1.0",
    "privacyAndCompliance": {
      // ...
    },
    "publishingInformation": {
      // ...
    },
    "permissions": [
      {
        "name": "alexa::devices:all:notifications:write"
      }
    ],
    "events": {
      "publications": [
        {
          "eventName": "AMAZON.MessageAlert.Activated"
        }
      ],
      "endpoint": {
        "uri": "arn:aws:lambda:xxx"
      },
      "subscriptions": [
        {
          "eventName": "SKILL_PROACTIVE_SUBSCRIPTION_CHANGED"
        }
      ],
      "regions": {
        "NA": {
          "endpoint": {
            "uri": "arn:aws:lambda:xxx"
          }
        }
      }
    }
  }
}