Communication Contracts: Shared State vs Message Passing

A customer is owed two refunds of 80 dollars each, one for a broken blender and one for a duplicate charge. Desk's lead starts two workers, and both return these results:

[
  { "worker": "payments", "status": "done", "summary": "Duplicate charge confirmed. The refund is part of the delivery case." },
  { "worker": "delivery", "status": "done", "summary": "Item broken twice, so it qualifies. Refunds are a payments matter." }
]

Both statements are true, both workers finished, and both results passed through the lead without an error