stuck on a laravel deployment error, need urgent help!

i'm completely stuck trying to deploy a new feature for my Laravel app, and i'm hitting a brick wall. its causing major downtime and i'm getting desperate.

• Project Context: we're pushing a major update to our 'Laravel Quick Fix & Consultation' platform, a new module that integrates with an external API.
• The Problem: after pushing to the production server, i'm getting a generic 500 server error. the laravel logs are showing a 'Class 'App\Services\ExternalApiService' not found' error, even though the file is definitely there and autoloaded locally. this is a classic laravel deployment error and it's driving me insane.
• What I've Tried So Far:
  • composer dump-autoload on the server.
  • php artisan optimize:clear and config:clear.
  • Checked file permissions for the App/Services directory (set to 755 for directories, 644 for files).
  • Verified the namespace and class name multiple times.
  • Pulled the latest code on the server, confirmed the file exists.
  • Restarted apache/nginx and php-fpm services.
  • Checked .env file for any missing variables related to the new service.
• Why It's Not Working: none of the usual fixes are working. its like the autoloader just isn't picking up this one specific class after deployment, but only on production. i'm out of ideas and have been at this for hours.
• Urgent Help Needed: has anyone encountered this exact 'class not found' issue specifically after a Laravel deployment error when the file is present? what else could i possibly be missing? or is there anyone offering quick consultation for these kinds of urgent laravel problems?