Each time someone changes their bank account number, administrators needs to know, so the reimbursement processs is not delayed unecessarily.
Anyone being able to see bank account should be able to subscribe to a notification that would be fired when an user changes the bank account number. The notification should be part of the daily digest.
Student is expected to send a patch for wikimedia-cz/tracker repository, hosted at Wikimedia Gerrit. When claiming task on GCI website, student should claim a respective Phabricator task as well.