[ 'domain' => env('MAILGUN_DOMAIN'), 'secret' => env('MAILGUN_SECRET'), 'endpoint' => env('MAILGUN_ENDPOINT', 'api.mailgun.net'), 'scheme' => 'https', ], 'postmark' => [ 'token' => env('POSTMARK_TOKEN'), ], 'ses' => [ 'key' => env('AWS_ACCESS_KEY_ID'), 'secret' => env('AWS_SECRET_ACCESS_KEY'), 'region' => env('AWS_DEFAULT_REGION', 'us-east-1'), ], 'slack' => [ 'notifications' => [ 'bot_user_oauth_token' => env('SLACK_BOT_USER_OAUTH_TOKEN'), 'channel' => env('SLACK_CHANNEL'), ], ], ];