[ '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'), ], 'firebase' => [ 'api_key' => env('FIREBASE_API_KEY'), 'auth_domain' => env('FIREBASE_AUTH_DOMAIN'), 'database_url' => env('FIREBASE_DATABASE_URL'), 'project_id' => env('FIREBASE_PROJECT_ID'), 'storage_bucket' => env('FIREBASE_STORAGE_BUCKET'), 'messaging_sender_id' => env('FIREBASE_MESSAGING_SENDER_ID'), 'app_id' => env('FIREBASE_APP_ID'), 'firestore' => env('FIREBASE_FIRESTORE', []), ], ];