curl --request POST \
  --url http://localhost:8000/api/v1/campaigns/drafts/{draft_id}/validate \
  --header 'Authorization: Bearer <token>'

{
  "valid": true,
  "errors": [
    {
      "field": "<string>",
      "code": "<string>",
      "message": "<string>"
    }
  ],
  "warnings": [
    "<string>"
  ],
  "draft": {
    "id": 123,
    "name": "<string>",
    "google_ads_customer_id": 123,
    "date_added": "2023-11-07T05:31:56Z",
    "date_updated": "2023-11-07T05:31:56Z",
    "market_analysis_id": 123,
    "campaign_name": "<string>",
    "website_url": "<string>",
    "daily_budget_micros": 123,
    "bidding_strategy": {
      "target_cpa_micros": 123,
      "target_roas": 1,
      "max_cpc_bid_ceiling_micros": 123
    },
    "default_match_type": "PHRASE",
    "language_ids": [
      123
    ],
    "location_targets": [
      {
        "geo_target_constant_id": 123,
        "target_type": "INCLUDE"
      }
    ],
    "network_settings": {
      "target_google_search": true,
      "target_search_network": false,
      "target_content_network": false
    },
    "ad_schedule": {
      "schedule_entries": [
        {
          "start_hour": 11,
          "end_hour": 12,
          "start_minute": 0,
          "end_minute": 0
        }
      ]
    },
    "start_date": "2023-12-25",
    "end_date": "2023-12-25",
    "conversion_goals": [
      {
        "conversion_action_id": 1
      }
    ],
    "extensions": {
      "sitelinks": [
        {
          "link_text": "<string>",
          "final_url": "<string>",
          "description_1": "<string>",
          "description_2": "<string>",
          "final_mobile_url": "<string>"
        }
      ],
      "callouts": [
        {
          "callout_text": "<string>"
        }
      ],
      "phone": {
        "phone_number": "<string>",
        "country_code": "<string>"
      },
      "structured_snippets": [
        {
          "values": [
            "<string>"
          ]
        }
      ]
    },
    "ad_groups_task_id": "<string>",
    "ad_groups_generation_status": "completed",
    "ad_groups_generation_error": "<string>",
    "extensions_task_id": "<string>",
    "extensions_generation_status": "not_started",
    "extensions_generation_error": "<string>",
    "is_published": false,
    "published_at": "2023-11-07T05:31:56Z",
    "published_campaign_id": 123,
    "all_rsas_generated": false,
    "ad_groups": [
      {
        "id": 123,
        "name": "<string>",
        "cpc_bid_micros": 25000000000,
        "keywords": [
          {
            "id": 123,
            "text": "<string>",
            "cpc_bid_micros": 25000000000,
            "final_url": "<string>",
            "source_market_analysis_keyword_id": 123
          }
        ],
        "rsas": [
          {
            "id": 123,
            "ad_group_id": 123,
            "headlines": [
              {
                "text": "<string>",
                "reason": "<string>"
              }
            ],
            "descriptions": [
              {
                "text": "<string>",
                "reason": "<string>"
              }
            ],
            "final_url": "<string>",
            "final_mobile_url": "<string>",
            "display_path_1": "<string>",
            "display_path_2": "<string>",
            "tracking_url_template": "<string>",
            "generation_status": "pending",
            "generation_task_id": "<string>",
            "generation_error": "<string>"
          }
        ]
      }
    ]
  }
}