fix(peppol): read Qvalia's prefixed UBL-JSON keys, add incoming probe (#1786)

Qvalia's UBL-JSON keeps namespace prefixes (cac:AccountingSupplierParty,
cbc:EndpointID) with attributes under `$` (verified live 2026-08-21 on the
inbound test invoice Joanna sent to 0007:5595386219), not the unprefixed
OASIS form the 409-recovery extractor assumed. Accept both. The probe gains
`incoming [integrationId]` to list inbound statuses or print one inbound
invoice as XML without marking it read.

Refs #546


Claude-Session: https://claude.ai/code/session_01TqFpxeWqbpR7bcwUJLRERQ

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

lib/invoices/__tests__/peppol-qvalia-transport.test.ts

@@ -271,8 +271,10 @@ describe('Qvalia transport: submit', () => {
       data: [{
         integrationId: 'int-dup',
         Invoice: {
-          ID: [{ _: 'F-2026-42' }],
-          AccountingSupplierParty: [{ Party: [{ EndpointID: [{ _: '556016-0680', schemeID: '0007' }] }] }],
+          'cbc:ID': [{ _: 'F-2026-42' }],
+          'cac:AccountingSupplierParty': [{
+            'cac:Party': [{ 'cbc:EndpointID': [{ _: '556016-0680', $: { schemeID: '0007' } }] }],
+          }],
         },
       }],
     }))
@@ -446,6 +448,16 @@ describe('helpers', () => {
     expect(extractUblJsonSupplierEndpoint({
       Invoice: { AccountingSupplierParty: [{ Party: [{ EndpointID: [{ _: '1', schemeID: '0007' }] }] }] },
     })).toEqual({ scheme: '0007', identifier: '1' })
+    // Qvalia's live shape: prefixed keys, attributes under `$`.
+    expect(extractUblJsonSupplierEndpoint({
+      Invoice: {
+        $: { xmlns: 'urn:oasis:names:specification:ubl:schema:xsd:Invoice-2' },
+        'cac:AccountingSupplierParty': [{
+          'cac:Party': [{ 'cbc:EndpointID': [{ _: '5567321707', $: { schemeID: '0007' } }] }],
+        }],
+      },
+      integrationId: 'a5845a11-4e5a-4700-bca3-e670a6cd8a79',
+    })).toEqual({ scheme: '0007', identifier: '5567321707' })
     expect(extractUblJsonSupplierEndpoint({ Invoice: {} })).toBeNull()
   })
 

lib/invoices/transports/qvalia.ts

@@ -242,18 +242,32 @@ export function extractUblDocumentId(xml: string): string | null {
 }
 
 /**
- * Dig the seller endpoint identifier out of a UBL-JSON invoice as Qvalia
- * returns it (OASIS UBL 2.1 JSON: arrays everywhere, text under `_`).
+ * UBL-JSON as Qvalia returns it (verified live 2026-08-21): xml2js style, so
+ * element keys keep their namespace prefix (`cac:AccountingSupplierParty`,
+ * `cbc:EndpointID`), every element is an array, text sits under `_` and
+ * attributes under `$`. The OASIS UBL-JSON form (unprefixed keys, attributes
+ * beside `_`) is accepted too.
  */
+function ublChild(record: Record<string, unknown> | null, name: string): unknown {
+  if (!record) return undefined
+  return record[name] ?? record[`cac:${name}`] ?? record[`cbc:${name}`]
+}
+
+function ublAttribute(element: Record<string, unknown> | null, name: string): string | null {
+  if (!element) return null
+  return asString(element[name]) ?? asString(asRecord(element.$)?.[name])
+}
+
+/** Dig the seller endpoint identifier out of a UBL-JSON invoice message. */
 export function extractUblJsonSupplierEndpoint(message: unknown): PeppolParticipant | null {
   const record = asRecord(message)
   if (!record) return null
-  const invoice = asRecord(record.Invoice) ?? record
-  const supplierParty = firstRecord(invoice.AccountingSupplierParty)
-  const party = firstRecord(supplierParty?.Party)
-  const endpoint = firstRecord(party?.EndpointID)
+  const invoice = asRecord(ublChild(record, 'Invoice')) ?? record
+  const supplierParty = firstRecord(ublChild(invoice, 'AccountingSupplierParty'))
+  const party = firstRecord(ublChild(supplierParty, 'Party'))
+  const endpoint = firstRecord(ublChild(party, 'EndpointID'))
   const identifier = asString(endpoint?._)
-  const scheme = asString(endpoint?.schemeID)
+  const scheme = ublAttribute(endpoint, 'schemeID')
   if (!identifier || !scheme) return null
   return { scheme, identifier }
 }