1. Download latest release
2. Create directory Credit at /var/www/paymenter/app/Extensions/Events
3. UnZip and upload files at /var/www/paymenter/app/Extensions/Events/Credit
4. Login into admin area and go to Extensions -> Credit -> Edit, fill Start Credit field and enable it to activate extension. GitHub:https://github.com/at0mweb/default-credit-paymenter