curl --request POST \
  --url https://api.contazen.ro/v1/invoice-series/{id}/set-primary \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "id": "<string>",
    "object": "invoice_series",
    "name": "<string>",
    "document_type": "fiscal",
    "description": "<string>",
    "start_number": 123,
    "next_number": 123,
    "format": "FACT-{year}-{number}",
    "is_primary": true,
    "is_used": true,
    "is_locked": true,
    "lock": {
      "device_id": "<string>",
      "session_id": 123,
      "user_id": 123,
      "device_name": "<string>",
      "device_platform": "<string>",
      "locked_at": 123
    },
    "year": 123,
    "created_at": 123
  },
  "meta": {
    "version": "v1",
    "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "response_time": "23.45ms"
  }
}