The players are expected to reimburse the 374 fans £9,350.
After a wasteful first half with both teams missing several chances to break the deadlock, Barnes opened the scoring for the hosts in the 63rd minute.
The defeat marks the first time City coach Pep Guardiola has lost four in a row in his managerial career.
The Norwegian striker secured his second consecutive hat-trick, extending City’s unbeaten record against the Hammers to 18 matches.
The 2024 awards ceremony will come up on January 19, next year, in the United Arab Emirates.
