Partial payments are turned off. But twice, I've had transactions being held at Authorize.net as pending, awaiting additional payment.
More info:
>> My events are $370. One of these partial payments had $100 authorized and the other registration had $362.06 authorized. In both cases authorize.net puts the transaction as 'Held' and is waiting for additional payment (to be manually entered).
>> Both events show as fully paid ($370) in the DT Register back-end. Both times a confirmation email was sent.
>> The customer support at authorize.net said that the transaction was sent to them as a partial payment type transaction. They also said that the [seemingly random] auth amounts were sent to them by the shopping cart software.





