The process of charge-backs is as follows:
Charge-backs (created and defended) are automatically created by the bank. There is no creator and no bill.
Hotel always gets notifications.
Charge back is raised by the guest meaning that the guest does not agree with the transaction.
MEWS team defends it on the property's behalf. To defend the charge-back MEWS always needs a proof. It can be cancellation policy, terms and conditions, correspondence with the guest etc. These documents need to be sent by the property (once you receive a notification) to email@example.com
The whole process takes minimum of one week.