PHP 7.3
Laravel 7.0
maybe laravel:6.X is fine.
at first you should run this.
composer install/update
either is fine.
Next, make .env file and set 'EBAY_APP_ID' at .env
it's ok to copy from .env.example to .env. then
set 'EBAY_APP_ID' at .env
then run application.
php artisan serve
https://developer.ebay.com/devzone/shopping/docs/CallRef/GetSingleItem.html#Samples
https://developer.ebay.com/devzone/xml/docs/reference/ebay/types/HitCounterCodeType.html