Create or update a campaign

curl --request POST \
  --url https://api.wanderersguide.app/functions/v1/create-campaign \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "id": 123,
  "created_at": "2023-11-07T05:31:56Z",
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "description": {
    "contents": {}
  },
  "join_key": "<string>",
  "notes": {},
  "recommended_options": {},
  "recommended_variants": {},
  "recommended_content_sources": {
    "enabled": [
      123
    ]
  },
  "custom_operations": [
    {}
  ],
  "meta_data": {}
}
'

{
  "status": "success",
  "data": {
    "name": "<string>",
    "id": 123,
    "created_at": "2023-11-07T05:31:56Z",
    "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "description": {
      "contents": {}
    },
    "join_key": "<string>",
    "notes": {},
    "recommended_options": {},
    "recommended_variants": {},
    "recommended_content_sources": {
      "enabled": [
        123
      ]
    },
    "custom_operations": [
      {}
    ],
    "meta_data": {}
  }
}