Not quite sure why your donor would want to use their company card, but I seem to recall that there are some corporate cards where the company is liable for the charge and some corporate cards where the individual is liable for the charge (and must apply to the company for reimbursement for charges that are company expenses). A credit charge is essentially a loan made to the responsible party, but that might, as I understand the matter, be the individual, even for a corporate card.
Of course, I'm still not sure why the donor would want to use the corporate card in this case, or how we would know the terms and conditions of the card and who is legally responsible for the charges, or what the company policy might be about such charges. And I also remember talking to an Annual Fund colleague who indicated that the convenience fee charged may be higher for a corporate card rather than an individual card.
So, probably better if your donor would make the payment another way, but I'm not quite as convinced as John is that the matter is entirely black and white.
My US$0.02 worth; the usual disclaimers apply.
Alan S. Hejnal
Data Quality Manager
Smithsonian Institution - Office of Advancement
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