diff --git a/src/features/invoice-sync/lib/SyncedInvoices.service.ts b/src/features/invoice-sync/lib/SyncedInvoices.service.ts
index 2d6d44c..6c3ae3b 100644
--- a/src/features/invoice-sync/lib/SyncedInvoices.service.ts
+++ b/src/features/invoice-sync/lib/SyncedInvoices.service.ts
@@ -308,6 +308,7 @@ class SyncedInvoicesService extends AuthenticatedXeroService {
         syncLogsService.setTx(tx)
         await syncLogsService.createSyncLog({
           ...prevSyncLog,
+          entityType: SyncEntityType.INVOICE,
           eventType: SyncEventType.PAID,
           status: SyncStatus.SUCCESS,
           syncDate: new Date(),
diff --git a/test/integration/webhook/invoicePaid/noPriorCreatedLog.test.ts b/test/integration/webhook/invoicePaid/noPriorCreatedLog.test.ts
new file mode 100644
index 0000000..b426562
--- /dev/null
+++ b/test/integration/webhook/invoicePaid/noPriorCreatedLog.test.ts
@@ -0,0 +1,45 @@
+import { buildPaidInvoiceWebhook } from '@test/fixtures/paidInvoice.webhook'
+import { seedConnectedPortal, seedSyncedInvoice } from '@test/helpers/seed'
+import { postWebhook } from '@test/helpers/webhook'
+import { setupWebhookTest } from '@test/helpers/webhookTestSetup'
+import { eq } from 'drizzle-orm'
+import { describe, expect, it } from 'vitest'
+import db from '@/db'
+import { failedSyncs } from '@/db/schema/failedSyncs.schema'
+import { syncedPayments } from '@/db/schema/syncedPayments.schema'
+import { SyncEntityType, SyncEventType, SyncStatus, syncLogs } from '@/db/schema/syncLogs.schema'
+
+describe('POST /api/webhook — invoice.paid without a prior created log', () => {
+  const apis = setupWebhookTest()
+
+  it('pays successfully even when no invoice.created log exists', async () => {
+    await seedConnectedPortal()
+    await seedSyncedInvoice({ status: 'success' })
+    // No seedSyncLog(): the invoice.created log is absent, so the paid log must
+    // default its NOT-NULL entityType rather than inherit it. Without the
+    // default the log INSERT rolls back the transaction after markInvoicePaid
+    // already ran, leaving a failed_syncs row that re-pays on retry.
+
+    const res = await postWebhook(buildPaidInvoiceWebhook())
+    expect(res.status).toBe(200)
+
+    expect(apis.xero.markInvoicePaid).toHaveBeenCalledTimes(1)
+
+    // The payment record is committed, so a retry short-circuits (no double pay).
+    expect(await db.select().from(syncedPayments)).toHaveLength(1)
+
+    // The paid success log still writes, defaulting entityType to invoice.
+    const paidLogs = await db
+      .select()
+      .from(syncLogs)
+      .where(eq(syncLogs.eventType, SyncEventType.PAID))
+    expect(paidLogs).toHaveLength(1)
+    expect(paidLogs[0]).toMatchObject({
+      status: SyncStatus.SUCCESS,
+      entityType: SyncEntityType.INVOICE,
+    })
+
+    // The payment succeeded, so nothing is recorded for retry.
+    expect(await db.select().from(failedSyncs)).toHaveLength(0)
+  })
+})