// config/subscribd.php
'gateways' => [
    'paypal' => [
        'driver'                       => \Pixelworxio\Subscribd\Gateways\PaypalGateway::class,
        'client_id'                    => env('PAYPAL_CLIENT_ID'),
        'client_secret'                => env('PAYPAL_CLIENT_SECRET'),
        'webhook_id'                   => env('PAYPAL_WEBHOOK_ID'),
        'mode'                         => env('PAYPAL_MODE', 'live'),
        'token_refresh_buffer_seconds' => env('PAYPAL_TOKEN_REFRESH_BUFFER', 60),
    ],
],

PAYPAL_CLIENT_ID=...
PAYPAL_CLIENT_SECRET=...
PAYPAL_WEBHOOK_ID=...
PAYPAL_MODE=live