Good luck getting a square answer from the help(less) desk. And, if you do get a comprehensible one, in anyb event it is not "controlling authority". But, but, but, your Honor the Office said ... Fugeddaboutit. You made a simple honest clerical error without deceptive intent. I made the exact same mistake. twice! Just correct it. Your application in question has not matured to a patent and this stuff can be corrected. I filed papers captioned "Authorization to Debit Additional Fees" and explained that, with no deceptive intent, Applicant yada yada yada. I'm uncomfortable with the idea that authorization to charge all additional fees will cut it. The Office relied on your (mine too) representation that client is/was a small entity. The Office is not even aware that additional fees are due. Even if the Office doesn't follow-up and debit the additional $, your paper is in the file and, IMO, would militate against any allegation of inequitable conduct wrt underpayment of fees. Just get it done b4 U get a Notice of Allowance and pay the issue fee. As much as I rant about the Office, they really are OK people, just overworked and will work with you.