The envelope's attachment assertions, optionally only those matching filter; read each with attachmentPayload, attachmentVendor and attachmentConformsTo.
attachment
filter
attachmentPayload
attachmentVendor
attachmentConformsTo
The envelope's
attachmentassertions, optionally only those matchingfilter; read each withattachmentPayload,attachmentVendorandattachmentConformsTo.