diff --git a/backend/src/app.ts b/backend/src/app.ts
index 4c8091f..e519272 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -143,6 +143,10 @@ app.use(route.post('/invoice', async (ctx) => {
 	ctx.status = 204
 }))
 
+app.use(route.get('/invoice/INV-:date(\\d{8})-:suffix(\\d+)', async (ctx, invoiceId, suffix) => {
+	ctx.body = `Invoice ID: INV-${invoiceId}-${suffix}`
+}))
+
 const port = parseInt(process.env.PORT ?? '3000')
 app.listen(port, () => {
 	console.log(`Server is running at http://localhost:${port}`)