I am using this vendor in YII2. Just download the zip file and extract into vendor folder with name as :
"ccbill-php-master" inside this folder having folder/files names - examples, src, tests, whmc, composer.json, phpunit.xml, readme.md, .gitignore, .travis.yml
Also add entry in my composer.json
"mcprohosting/ccbill":"dev-master"
But it is showing error : Class 'Mcprohosting\Ccbill\Client\CcbillClient' not found
Please advice.