A participant selected a specific registration type with a specific fee ($30) and now they want to change to a different registration type, but the fee is higher ($50). Can the system process a new transaction, in this case $20, and add it to the original $30 registration fee?
This is not an available feature. In order to maintain PCI (Payment Card Industry) compliance, Blackbaud is not allowed to transmit any credit card information to any type of a storage system other than our credit card processing system. Because of this, we are unable to enact a new charge on a completed transaction. You can find more information on Blackbaud's PCI Compliance and Data Security policies here.
The original transaction in this case needs to be reversed and refunded. The participant can then enter a new transaction for the new, more expensive registration level.