Opencart's Store's Customer Credit payment module allows approved customers or guests (depends on settings) to buy using credit. Administrators cant set Credit Balance limit or Customers Group that will be able to use Store's Credit.

Also it does inform Customers about their current balance using custom text message that can be altered from Module's settings.

Features

Set MAx Balance

Set Customer Groups that can use Credit Option

Enable/ DIsable Credit for Guests

Custom Notifications in Every installed Languages including Current Balance

Demo for Opencart 3
site
admin

Demo for Opencart 2
site
admin

For Demo purposes use the system's demo customer
username: demo@demo.com
password: demo