Adding Funds to a Customers Account

[shoptocreate]

I want to add money to a customers account without sending them a gift certificate. Is that possible?
And if the customer has a gift certificate balance already - how can I increase that? (This one I know is possible since a store I buy from did this to my GC balance) Thanks for your help

[stevesh]

There's this:

http://www.zen-cart.com/downloads.php?do=file&id=373

It's eight years old and was written for a much earlier version of Zencart, so it's unlikely to work with the current version, but you might try it on a test site or examine how the author did things and update it.