curl --request POST \
  --url 'https://api.flashcat.cloud/channel/unsubscribe/rule/update?app_key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "channel_id": 123,
  "rule_id": "<string>",
  "rule_name": "<string>",
  "description": "<string>",
  "filters": [
    [
      {
        "key": "title",
        "oper": "IN",
        "vals": [
          "<string>"
        ]
      }
    ]
  ]
}
'

{
  "error": {
    "code": "<string>",
    "message": "<string>"
  },
  "data": {
    "rule_id": "<string>",
    "rule_name": "<string>"
  }
}