[PENDING] Business Pay - Update to use new db versioning/common code models

Business pay has custom code models to support both pay in GCP and NATS for filer in OCP.

We need to update its reference to the new db versioning module/new common code models without introducing conflicts.

TBD

The issue points to Business Pay's custom code models and their references to the database-versioning module and common code models. Start by locating those models and current references; done means they use the new versions without conflicts, but the required files and validation steps are not specified.

Written by the indexing model from the issue text.