Create a campaign

curl --request POST \
  --url https://api.vocobase.com/api/v2/campaigns \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Black Friday outreach",
  "description": "Outbound to VIP customers",
  "agent_id": "a1234567-abcd-1234-abcd-123456789012",
  "provider": "twilio",
  "concurrency_limit": 3
}
'

{
  "success": true,
  "data": {
    "campaign_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "description": "<string>",
    "agent_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "agent_name": "<string>",
    "provider": "mcube",
    "concurrency_limit": 5,
    "status": "draft",
    "total_contacts": 123,
    "completed_count": 123,
    "failed_count": 123,
    "skipped_count": 123,
    "started_at": "2023-11-07T05:31:56Z",
    "paused_at": "2023-11-07T05:31:56Z",
    "completed_at": "2023-11-07T05:31:56Z",
    "created_at": "2023-11-07T05:31:56Z"
  }
}