According to PubSub deprecation plan, mod-feesfines will stop publishing events to PubSub in favour of publishing directly to Kafka.
mod-feesfines will also implement Transactional outbox pattern.

In scope:

• Instead of publishing FEE_FINE_BALANCE_CHANGED event, insert a new record into message_outbox table. This insert should be part of the same transaction that updates the balance.

• Trigger Message relay service

PubSub deprecation plan: https://folio-org.atlassian.net/wiki/display/DD/PubSub+deprecation+plan
Read more about Transactional outbox pattern: https://microservices.io/patterns/data/transactional-outbox.html