Charging a single card in one day will flag the transactions as possible fraud.
To prevent credit cards from being flagged with fraudulent charges, do this:
Instead of charging the same card multiple times, run the card against 1 invoice, but override the amount charged to be the total for the day.
Then use the Commands > Apply Credits, which will distribute the overcharge on that invoice to the other invoices to be paid.
Inserted 5/20/2015 – SV