Left file: appwork-v1_3_1/laravel-starter/config/services.php  
Right file: appwork-v1_4_0/laravel-starter/config/services.php  
<?php = <?php
     
return [   return [
     
    /*       /*
    |--------------------------------------------------------------------------       |--------------------------------------------------------------------------
    | Third Party Services       | Third Party Services
    |--------------------------------------------------------------------------       |--------------------------------------------------------------------------
    |       |
    | This file is for storing the credentials for third party services such       | This file is for storing the credentials for third party services such
    | as Stripe, Mailgun, SparkPost and others. This file provides a sane <>     | as Mailgun, Postmark, AWS and more. This file provides the de facto
    | default location for this type of information, allowing packages       | location for this type of information, allowing packages to have
    | to have a conventional place to find your various credentials.       | a conventional file to locate the various service credentials.
    | =     |
    */       */
     
    'mailgun' => [       'mailgun' => [
        'domain' => env('MAILGUN_DOMAIN'),           'domain' => env('MAILGUN_DOMAIN'),
        'secret' => env('MAILGUN_SECRET'),           'secret' => env('MAILGUN_SECRET'),
        'endpoint' => env('MAILGUN_ENDPOINT', 'api.mailgun.net'),           'endpoint' => env('MAILGUN_ENDPOINT', 'api.mailgun.net'),
    ],       ],
     
    'postmark' => [       'postmark' => [
        'token' => env('POSTMARK_TOKEN'),           'token' => env('POSTMARK_TOKEN'),
    ],       ],
     
    'ses' => [       'ses' => [
        'key' => env('AWS_ACCESS_KEY_ID'),           'key' => env('AWS_ACCESS_KEY_ID'),
        'secret' => env('AWS_SECRET_ACCESS_KEY'),           'secret' => env('AWS_SECRET_ACCESS_KEY'),
        'region' => env('AWS_DEFAULT_REGION', 'us-east-1'),           'region' => env('AWS_DEFAULT_REGION', 'us-east-1'),
    ],       ],
     
    'sparkpost' => [ +-  
        'secret' => env('SPARKPOST_SECRET'),    
    ],    
     
    'stripe' => [    
        'model' => App\User::class,    
        'key' => env('STRIPE_KEY'),    
        'secret' => env('STRIPE_SECRET'),    
        'webhook' => [    
            'secret' => env('STRIPE_WEBHOOK_SECRET'),    
            'tolerance' => env('STRIPE_WEBHOOK_TOLERANCE', 300),    
        ],    
    ],    
     
]; = ];