curl --request POST \
  --url https://api.eflow.team/v1/networks/creatives \
  --header 'Content-Type: application/json' \
  --header 'X-Eflow-Api-Key: <api-key>' \
  --data '
{
  "network_offer_id": 1,
  "name": "Banner 300x250",
  "creative_type": "image",
  "creative_status": "active",
  "is_private": false,
  "is_apply_specific_affiliates": false
}
'

{
  "network_offer_creative_id": 123,
  "network_id": 123,
  "network_offer_id": 123,
  "name": "<string>",
  "creative_type": "image",
  "is_private": true,
  "creative_status": "active",
  "resource_url": "<string>",
  "html_code": "<string>",
  "width": 123,
  "height": 123,
  "email_from": "<string>",
  "email_subject": "<string>",
  "time_created": 123,
  "time_saved": 123,
  "additional_offer_ids": [
    123
  ],
  "is_apply_specific_affiliates": true,
  "relationship": {
    "offer": {
      "network_offer_id": 123,
      "network_id": 123,
      "network_advertiser_id": 123,
      "network_offer_group_id": 123,
      "name": "<string>",
      "offer_status": "<string>",
      "network_tracking_domain_id": 123,
      "visibility": "<string>",
      "currency_id": "<string>"
    },
    "resource_asset": {
      "network_asset_id": 123,
      "content_type": "<string>",
      "filename": "<string>",
      "url": "<string>",
      "file_size": 123,
      "image_width": 123,
      "image_height": 123
    }
  }
}