The difference between a Notification of Chargeback (NoC) and a Chargeback is explained below:
A Notification of Chargeback is the notification we send as soon as we know that a dispute has been filed by the issuing bank. At this point, merchants should treat the transaction as charged back and can begin reviewing the case and compiling evidence for a defense.
The Chargeback event that follows (or sometimes occurs on the same day as the Notification of Chargeback) is the actual debit from the issuing bank. If you accept the dispute, or fail to upload your defense documents, this is the final status.
Find more information in our documentation here: Dispute flow and process