TransferCompletionMessageSchema
@typestringrequired
Example: 
TransferCompletionMessageproviderPidstringrequired
Example: 
provider-pid-789consumerPidstringrequired
Example: 
consumer-pid-123TransferCompletionMessageSchema
{
  "@type": "TransferCompletionMessage",
  "providerPid": "provider-pid-789",
  "consumerPid": "consumer-pid-123"
}