I think the credit module should support coupon codes or discount code. If it actually serves all the purposes it was created for then having a coupon/discount code that can be created from the admin panel is not a bad idea.
I personally need this features so if you can modify mine, please leave a comment and let's discuss what it will cost.
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Hi Kelvin30286063 - we can possibly modify it to to your spec, the advantage then is that it would be pushed into the version update so you would not need ongoing maintenance. I will send you a PM.