Verifying transactions with csv attachments - building a transaction

Flow.kt

private fun transaction(): TransactionBuilder =
  TransactionBuilder(notary()).apply {
    val attachmentId = attachment()
    addOutputState(message)
    addCommand(Command(Send(attachmentId), message.participants.map(Party::owningKey)))
    addAttachment(attachmentId)
  }

private fun attachment(): AttachmentId {
  return serviceHub.attachments.queryAttachments(
    AttachmentQueryCriteria.AttachmentsQueryCriteria(
      filenameCondition = Builder.equal(
        attachmentName
      )
    )
  ).first()
}

Dan,

I think you forgot adding attachmentName as an input parameter in your function signature; it should be:

private fun attachment(attachmentName: String): AttachmentId