as an aside, i get a little weary of "corporate support voice" as you exhibit here, when representing a company, including the initial "thanks!" and "restating the problem" multiple times so the customer feels (accurately) heard. you could have just said,

"We haven't seen drop offs in conversion so far, mainly because we verify after checkout, not before.", which answers the question more directly and succinctly.

no offense to you of course. it's better to get an overly verbose, but still informative, response than none. and the product looks genuinely useful to online businesses.