If someone agrees to be billed X per month and you bill them X + you are looking at a hard situation with chargebacks and refunds. The cardholder would prevail in such a situation unless you get some sort of verification prior to billing them for a different amount than they expect.
I'm not saying you can't do it, especially on your own merchant account, but what I am saying is that you'd best be ready to issue credits and refunds at the drop of a hat or you'll find yourself over the allowable limits very quickly.
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