Issue additional premium notices

Trigger: A policy endorsement, coverage change, or premium audit results in an increase to the policyholder's total premium obligation.

1. Receive notification of policy change or audit completion
2. Calculate the exact additional premium amount due
3. Format and generate the premium notice document
4. Transmit the notice to the policyholder and broker
5. Update the billing system with the new receivable amount

Outcome: An additional premium notice is generated, sent to the policyholder, and the billing system is updated to reflect the new balance owed.