laravel-bitunix-api/config/bitunix-api.php

<?php

return [

    'future_base_uri' => 'https://fapi.bitunix.com/',
    'api_key' => env('BITUNIX_API_KEY'),
    'api_secret' => env('BITUNIX_API_SECRET'),
    'language' => 'en-US',
];