curl --request POST \
  --url https://api.callers.ai/campaigns/{campaignId}/webhook/subscribe \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "url": "<string>",
  "events": [
    "POST_PROCESSING_FINISHED:INTERESTED",
    "POST_PROCESSING_FINISHED:NOT_INTERESTED",
    "POST_PROCESSING_FINISHED:CALL_ME_LATER",
    "POST_PROCESSING_FINISHED:WRONG_NUMBER",
    "POST_PROCESSING_FINISHED:DO_NOT_CALL"
  ],
  "isAdvanced": false,
  "advancedWebhook": {
    "url": "<string>",
    "method": "GET",
    "headers": [
      {
        "name": "<string>",
        "value": "<string>"
      }
    ],
    "parameters": [
      {
        "name": "<string>",
        "value": "<string>"
      }
    ],
    "body": ""
  }
}'

{
  "status": "success",
  "data": true
}