What does a successful Attachments transaction response look like?

For a successful Solicited or Unsolicited transaction, you'll receive the following:

{
    "status": "success",
    "attachmentId": "c8f5fdc7-d71c-5cf8-f68c-2e87eff625bf_12B19_999898"
}

Your workflow for API consumers should retain this notification for every transaction they send. It contains a unique value called the traceId, which is a 128-bit UUID value that's generated and sent by the clearinghouse whenever it receives a new attachment transaction.

The traceId is a reference value should a user need to check the status of an attachment submission.

The acknowledgement appends the tradingPartnerServiceId (12B19 in this example, which is the payer ID), along with the submitterId (999898 in this example).