A bulk process is any action that could be performed to more than 1 record at a single time, including all emails and exports.
You can view the status of each request (Created / Started / Finished) while the system is completing the action.
Sometimes when processing a request the system will fail and cause an error to be shown. Errors will provide you with the reason for the error and (if applicable) a link to the record that had the error. This will allow you to fix the record and attempt the update again.
SCHEDULE_INVALID - There is something incorrect about the booking payment schedule
UNSUPPORTED_OPERATION - Part of the request is invalid
INVALID_ROOMING_INPUT - There is something about the rooming request that is invalid
No customer found with given email - We could not connect to the payment gateway correctly