curl --request POST \
  --url https://api.kataven.ai/v1/api/v1/campaigns \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data 'name=<string>' \
  --data 'agent_id=<string>' \
  --data 'phone_number_id=<string>' \
  --data max_concurrent_calls=123 \
  --data retries_per_contact=123 \
  --data retry_delay_seconds=123 \
  --data 'scheduled_at=<string>' \
  --data 'contacts=<string>'

{
  "agent_id": "<string>",
  "completed_at": "<string>",
  "created_at": "<string>",
  "created_by": "<string>",
  "id": "<string>",
  "max_concurrent_calls": 123,
  "name": "<string>",
  "phone_number_id": "<string>",
  "retries_per_contact": 123,
  "retry_delay_seconds": 123,
  "scheduled_at": "<string>",
  "started_at": "<string>",
  "status": "<string>"
}