Decision rule: when to stop sending traffic to a late payer

Decision rule: when to stop sending traffic to a late payer
Everyone knows they should stop. Almost nobody does, because the campaign is performing and stopping feels like losing.
Make it mechanical:
— One late payment with a proactive explanation and a new date they then meet: continue, and note it.
— One late payment you had to chase: reduce volume until a full cycle settles cleanly.
— Two consecutive late payments: stop new spend. Not reduce. Stop. Let the receivable come down.
— Any change to payment terms applied without agreement: stop, and get it in writing.
— Any request to invoice a different entity, or be paid from an unrelated account: stop and escalate.
The reasoning is simple. While they are late, you are increasing the amount at risk every day you continue. If they are in trouble, the final periods are the ones that never get paid, and you are choosing how large those periods will be.
The performing campaign is exactly why the exposure is dangerous.