List API Keys

curl https://www.unosend.co/api/v1/api-keys \
  -H "Authorization: Bearer un_xxxxxxxxxx"

{
  "data": [
    {
      "id": "key_123",
      "name": "Production Server",
      "created_at": "2024-01-15T10:30:00.000Z"
    },
    {
      "id": "key_124",
      "name": "Development",
      "created_at": "2024-01-16T10:30:00.000Z"
    }
  ]
}