curl --request GET \
  --url https://api.paywalls.ai/v1/webhooks/subscriptions \
  --header 'Authorization: Bearer <token>'

{
  "subscriptions": [
    {
      "id": "<string>",
      "paywallId": "<string>",
      "url": "<string>",
      "events": [
        "<string>"
      ],
      "isActive": true,
      "description": "<string>",
      "customHeaders": {},
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z",
      "createdBy": "<string>",
      "consecutiveFailures": 123,
      "lastDeliveredAt": "2023-11-07T05:31:56Z",
      "secretSuffix": "<string>",
      "secret": "<string>"
    }
  ]
}