List refill configurations.

Example response

{
  "data": [
    {
      "account_id": "account_0194f4e3a2b77c6aa91c4f6b4db2a980",
      "metric_id": "metric_0194f4e3a2b77c6aa91c4f6b4db2a980",
      "minimum_balance": "100.0",
      "target_balance": "100.0",
      "is_active": true,
      "created_at": 1767225600,
      "updated_at": 1767225600
    }
  ]
}