curl --request POST \
  --url 'https://api.flashcat.cloud/channel/unsubscribe/rule/create?app_key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "channel_id": 3521074710131,
  "rule_name": "Drop test environment alerts",
  "description": "Discard all alerts from the test environment before they create incidents",
  "filters": [
    [
      {
        "key": "labels.env",
        "oper": "IN",
        "vals": [
          "test",
          "dev"
        ]
      }
    ]
  ]
}
'

{
  "request_id": "01HK8XQE3Z7JM2NTFQ5YJ8P9R4",
  "data": {
    "rule_id": "69db2f6ba0fe7db6448b1505",
    "rule_name": "Test drop rule"
  }
}