List all notification subscriptions

1{
2  "data": [
3    {
4      "id": "b8627ae8-732b-4d25-b947-1df8f4007a29",
5      "endpoint": "https://example.org/handler/for/notifications",
6      "subscriptionDetails": [
7        {
8          "url": "arn:aws:sns:us-east-1:<...>:fcb4a2c9-9c4f-4706-b312-6b22650f5d17",
9          "status": "confirmed"
10        }
11      ]
12    }
13  ]
14}