curl --request POST \
  --url https://api.paywalls.ai/v1/webhooks/subscriptions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "url": "<string>",
  "events": [
    "<string>"
  ],
  "description": "<string>",
  "customHeaders": {},
  "secret": "<string>"
}'

{
  "subscription": {
    "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>"
  }
}