curl --request POST \
  --url https://www.trysignalbase.com/api/v2/webhooks/{id}/test \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "success": true,
    "delivery_id": "9c8b7a65-4d3e-4f21-8a0b-1c2d3e4f5a60",
    "event_id": "1f2e3d4c-5b6a-4790-8a1b-2c3d4e5f6071",
    "event_type": "system.test",
    "response_status": 200,
    "response_body": "ok"
  },
  "meta": {
    "endpoint": "webhooks.test",
    "creditsUsed": 0
  }
}