Heartland Payment Systems answer:
You need to force a new transaction through the Pin Pad using the swipe option.?
Thanks
Team TSYS
Dharma Merchant Services answer:
Certain credit/debit cards will not allow this, and based on the card-issuing bank, you may be forced to use a PIN number. The only way around this is to "trick" the system by keying the sale in. Ultimately, your customer's bank has chosen to require a PIN for card-present sales, and as such, you can only take the card without a PIN by classifying the sale as "card not present" which results in a higher interchange rate structure.